A collection of tissues which work together to accomplish a function. The organisational unit above tissues and below systems.
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2answers
230 views
Why Is Most Life Symmetrical Externally But Not Internally?
Mammals, reptiles, arachnids, insects, etc are all as far as I am aware symmetrical in appearance.
Take a human for instance, make a line from the top of our head right down the middle. However, ...
9
votes
1answer
91 views
Organ cloning - possible to make a non-antigenic organ?
From a J. Neil Schulman article on Organ Cloning:
Cannibalizing organs from other people also entails the risk of
rejection because of incompatibilities, not only for tissue-typing but
also ...
8
votes
1answer
79 views
Which aspects of renal physiology are standing in the way of an artificial (mechanical) kidney?
Scientists have been able to create artificial organs with varying degrees of success. The mechanical heart (in its various forms, e.g. ventricular assist) is able to sustain life for some period of ...
7
votes
3answers
115 views
Is the appendix a vestigial structure in all vertebrates?
In humans the Appendix is a vestigial organ. Does it serve no apparent purpose in all the vertebrates that have one?
7
votes
2answers
1k views
What are the consequences of voluntary total celibacy?
Psychologically this might be a tough question, but in means of biology, what are the effects of total celibacy on the gonads and the nervous system concerning both man and woman in short and long ...
6
votes
1answer
121 views
Can oxygen diffuse out through the lungs?
Let's say you accidentally walk into a room pressurized with pure nitrogen (or you're jettisoned into space). Within a couple of seconds, the partial pressure of oxygen within your lungs drops to 0. ...
5
votes
2answers
73 views
What metabolic activities are performed by a developing human fetus's liver?
I understand that organ function varies with the stages of development. Does a fetal liver EVER perform lipogenesis, gluconeogenesis, make bile, etc? Or does it only begin performing these actions ...
4
votes
0answers
90 views
What is the life-span of the various organs in the human body?
It is possible for a person to donate the harvestable organs (kidneys, eyes, and such) posthumously. Let's assume for a moment that the technology exists to kill rejection, and maintain the organ in ...
3
votes
2answers
97 views
Why is most tissue cellular?
Most tissue is comprised of cells. Why? It would seem inefficient to have so many individual nucleus, membranes, etc.?
Specifically: Not all tissue is cellular. Much tissue is extracellular matrix. ...
