The exchange of gases across organs that facilitate transport of the gases to and from the cells of the organism.

learn more… | top users | synonyms

0
votes
0answers
12 views

burying food scrap in soil: aerobic or anaerobic reaction?

I have been trying to avoid putting food scrap into trash so I have been burying them in the backyard. However, someone just asked me whether I was actually creating anaerobic reaction out of food ...
2
votes
0answers
15 views

What is a rough estimate of CO₂ saturation for high-yield or high growth rate plants?

Naturally, plants have individual photosynthesis capacities, but it would still be interesting to get a general picture of CO2 saturation levels for some common cultures. Where lies the optimal yield, ...
1
vote
1answer
36 views

Can you replace glucose with glycerol in cell media?

In order to feed an animal cell in process called Respiration, can I replace Glucose with Glycerol? The Equation bellow: Glycerol + Oxygen -> Water + Carbon Oxide
0
votes
0answers
18 views

Abdominal muscles during inspiration/inhalation

During inspiration I am aware that the diaphragm and the external intercostal muscles contract, thus increasing the volume of the thoracic cavity. However, I read on my textbook that during ...
-2
votes
1answer
58 views

What cause the urge to inhale in humans? [closed]

The urge to inhale in humans result from (a) rising pCO2 (b) rising pO2 (c) falling pCO2 (d) falling pO2 p stands for partial pressures. I am guessing the answer is falling pCO2.... but I wanted what ...
-1
votes
1answer
45 views

What is the path taken by an oxygen molecule as it passes into the lungs to a muscle cell in the body? [closed]

My teacher tried to describe this question to me, but I just don't get it.
2
votes
2answers
82 views

What causes people to feel sleepy due to recycled air?

I notice this the most in cars, when I set the air con to recycling air (instead of pulling in fresh air). After a while, I start to feel sleepy, and the sleepiness passes almost as soon as I open a ...
4
votes
1answer
36 views

What is a lethal dose of THC?

With the oil form of THC being stronger then ever. What would happen if one was to take a stomach full of THC oil?
1
vote
1answer
36 views

Why can one swim longer underwater by blowing out air?

I am a human. I take a deep breath. I swim underwater... After some time, I need to blow out some air. I blow out some air... By doing so, I can swim underwater longer. Blowing out some air gives me ...
8
votes
3answers
287 views

How does the body switch between aerobic and anaerobic respiration?

Lets take the case of a person doing heavy exercise. Aerobic respiration is taking place, but oxygen is about to be finished up. Glycolysis occurs, Krebs cycle finishes. Now NADH and FADH enter ...
2
votes
1answer
77 views

When you take a very cold or hot bath how is that influencing your breath?

It looks like when you take a cold shower or bath your veins get smaller and when you take hot shower your veins get wider. But is that right and do you need to breath more in both cases because you ...
1
vote
0answers
33 views

About photosynthesis VS respiration [closed]

Is it true to say that the electron transport chain in photosynthesis and respiration is slightly different, regarding to the direction of H+ pumping and flowing back in through ATP synthase? ...
3
votes
1answer
131 views

HOw are AMP's “recharged” to become ATP's in a cell?

I understand that after the translation stage of ribosomal protein synthesis, tRNA molecules are floating in the cytoplasm without attached amino acids until they find the correct aminoacyl tRNA ...
7
votes
1answer
85 views

About acetyl-coA in the Krebs Cycle of respiration

In respiration, Krebs cycle starts with acetyl coenzyme A which is made from pyruvate. However, it is said that the cycle keeps repeat it self with oxaloacetate turning back to citrate and cycle ...
6
votes
2answers
276 views

How do plants get their O₂ for respiration during the night?

If I am not mistaken the stomata are closed during the night. As a result I have a hard time to imagine how the plant can get the O2 it needs for respiration during the night. I thought the plant ...
17
votes
1answer
239 views

How do burrowing animals get enough oxygen?

Tree borers make a small hole in a tree. At the end of it, they chew on wood to elongate the tunnel. They digest food and grow. All this takes oxygen. The entrance to the tunnel is generally small. ...
19
votes
1answer
275 views

Why do you die if you cannot breathe?

I was wondering what the actual reason for death by suffocation is. Obviously it is related to oxygen deprivation. But what is the underlying cause of death? Is it due to insufficient oxygen for ...
4
votes
1answer
118 views

What causes inhalation during breathing?

I have read here that the two major inhalation muscles are the (1) diaphragm and the (2) external intercostals. Additionally, inhalation can also be caused by (1) expansion of the abdominal cavity, ...
0
votes
0answers
11 views

how is humidity related to amount of water we should drink [duplicate]

Is there any kind of relation between humidity and the amount of water we should drink. I know there is a relation between the temperature and the amount of water needed by the body. Do we need to ...
4
votes
0answers
23 views

Non-cumbersome respiration sensor for sleep study?

I'm working on a project where I collect ECG signal from multiple volunteers, derive ECG derived respiration(EDR) from the timestamped ECG signal and calculate the cross correlation between EDR and ...
0
votes
1answer
87 views

How does the partial pressure of oxygen affect mental focus?

On this Wikipedia page it says that lower oxygen levels can cause light-headedness. Is there evidence that higher partial pressure of oxygen can improve mental focus?
5
votes
2answers
220 views

A doctor might give bicarbonate (HCO₃¯) to a patient who is breathing very rapidly. What is the doctor assuming about the patient’s blood chemistry?

The answer is: The doctor is assuming that the rapid breathing is the body’s response to low blood pH. (Source: Campbell Biology) But this answer doesn't make sense. Why would the doctor give the ...
11
votes
4answers
11k views

How can we differentiate between respiration and breathing?

I am a student of 10th grade, and I eagerly want to learn biology. What is the difference between respiration and breathing?
2
votes
4answers
536 views

Why *morning walk*?

My PT teachers professes working-out/training in early morning hours is the best time to do so, a quick search on benefits of morning walk (or some similar phrase) reveals a lot of information which ...
3
votes
1answer
123 views

How does a metronome help in controlling breathing rate?

I'm new to the Bio/Medical field so kindly bear with me. I am doing studies on volunteers to formulate algorithms for evaluating Respiration rate from ECG and accelerometer data. I learned about this ...
2
votes
1answer
114 views

Atelectasis due to decreased surfactant in lungs

Surfactant is a protein lipid mixture produced by alveolar pneumocytes composed of Dipalmitoyl Phosphatidyl Choline lipid, apoproteins and calcium ions. This surface lines the alveolar epithelium ...
2
votes
1answer
54 views

Why is an increase in the amount of oxygen in the atmosphere favorable for life?

I have followed the David Attenborough series on 'First life' and heard, that an increase in the amount of oxygen in the atmosphere, as it took place just before the Cambrium, is generally favorable ...
3
votes
1answer
110 views

What's the (or some of the) minimum(s) amount of atmospheric carbon dioxide needed by plants?

We currently have a problem of increasing CO2 in the atmosphere. But assuming we find a way to carbon sink it, what is the minimum CO2 we need to leave in the atmosphere to provide a source for ...
1
vote
3answers
200 views

Does the necessary Carbon Dioxide need to be in the atmosphere for mammals?

In the answers to this question, we've learnt that carbon dioxide is necessary for mammalian life, but is it necessary in the atmosphere/to breathe it in? Or does the act of respiration give a ...
21
votes
2answers
450 views

What are the side-effects of long-term liquid breathing?

I just saw a recent Physics question that mentioned liquid breathing (which I had never heard of before) and I started to wonder about its long-term effects. Let's imagine a person underwent liquid ...
1
vote
0answers
2k views

Highest Pressure Human Body Can Survive In?

One design for underwater human inhabited environments is to have equal pressure between the surrounding water and the submerged habitat, thus allowing a section of the floor to be open to the water ...
5
votes
1answer
263 views

Is oxidative phosphorylation less efficient in gram positive bacteria?

Gram negative bacteria perform oxidative phosphorylation in their periplasmic regions, between the inner and outer membrane where a proton gradient is maintained and used by the ATP synthase to make ...
2
votes
2answers
150 views

Bohr effect in respiration

Would I be correct in saying that the Bohr effect is ONLY related to the concentration of [H+] in the tissues. Obviously the concentration of carbon-dioxide can contribute to this concentration by ...
3
votes
1answer
53 views

Why are particulate matter toxic to humans?

There are many studies on fine particles (PM2.5) and their fully negative effect on human health. There doesn't seem to have any positive aspect of inhaling particles, except very particular ones, but ...
2
votes
1answer
93 views

What is the role of lamellar bodies in lung cells?

Lamellar bodies have been found to be secreted in lung cells many of their associated proteins have been identified. What is the current consensus or research on the function that these lamellar ...
3
votes
0answers
61 views

Are small CO₂ concentrations devastating to certain cognitive tasks?

A new study shows strong effects of what should be a negligible CO2 concentration. The paper "Is CO2 an Indoor Pollutant? Direct Effects of Low-to-Moderate CO2 Concentrations on Human Decision-Making ...
1
vote
1answer
311 views

Breathing under water

Why can fish breathe under water but land mammals can't? How can fish extract oxygen straight from water but humans can't?
1
vote
1answer
36 views

Relation between respiration and concentration of citric acid

A and B are 2 reactions. If there is an excess availability of citrate, then which of the above reactions will prevail? I know that citric acid is formed when oxaloacetic acid reacts with acetyl ...
7
votes
5answers
11k views

Why don't we breathe nitrogen when it makes most of the air?

Why don't we breathe nitrogen while it makes most of the air? Why do we always tend to breathe oxygen, not hydrogen and nitrogen?
0
votes
0answers
29 views

How does vasomotor and bronchomotor reactions equilibrate local blood flow to correspond local ventilation?

I am trying to find some figure(s) to explain this. There is probably better name for "bronchomotor" reaction. They seem to opposite terms and actually affecting same things (alveolar diameter/tone); ...
3
votes
2answers
191 views

Electronic cigarettes (e-cigs), any health risks?

Background: An electronic cigarette (e-cig or e-cigarette) is a battery-powered device which simulates tobacco smoking patented in 1963 by Herbert A. Gilbert. It generally uses a heating element ...
3
votes
1answer
696 views

What are the highest and lowest possible pH, paCO2 and HCO3 in the blood of living human?

What are the highest and lowest possible values of pH, $paCO_2$, and $HCO_3$ in the (arterial or venous) blood of a living human being?
1
vote
3answers
2k views

Why do we exhale after we hold our breath?

I tested this out with my friends, and I find that after they hold their breath and can't hold it anymore, they exhale air, instead of inhaling air. Interestingly, they all try to inhale in as much ...
0
votes
1answer
59 views

Effect of respiration on Arterial pressure

I am trying to explain the effect of respiration on arterial pressure. I am looking preferably some visual way to show it. How can you show the effect of respiration on arterial pressure? I am ...
1
vote
1answer
32 views

Different level of toxicity between smoke

Has there been studies on the difference between the smoke generated from: cigarette or cigar manufactured by brands which are proven to contain more than a hundred of dangerous additional ...
1
vote
1answer
532 views

Breathing in and out

I was reading my textbook and it says that breathing involves inhaling and exhaling but it doesn't say whether they happen simultaneously or sequentially. Also is my overall understanding of ...
10
votes
1answer
2k views

How long can a bee surive in a jar?

So, some people and I encountered an adventure game where you have a bee in a jar and need to move it from place to place before it suffocates, and someone tried to find out how long a bee would ...
1
vote
1answer
122 views

Effects of smoking tobacco compared to inhaling other smoke

How much less dangerous is breathing smoke from burning wood and coal compare to smoking tobacco? Edit: Sorry. I should have made the question clearer. If this were an experiment, it would be set ...
0
votes
1answer
80 views

How does the matter that makes up the fat of your fat cells ultimately leave your body--following weight loss?

I'd like to get some clarification on specifically how the matter from the fat reserves of the Adipocyte physically leaves the body. In other words, if you were to somehow follow every atom in the ...
1
vote
2answers
653 views

What gases are needed for humans to breathe?

I will be beginning a science project about sustaining life on space stations. I already know that pure oxygen is harmful for humans but would $O_2$ + $CO_2$ be enough for humans to breathe in or do ...