New answers tagged

2

As @Roshelle Perera points out, the textbook reason for differential solute and water movement in different parts of the LoH is osmolarity, which is nicely explained in this wikipedia article. Coming to an interesting point, about the movement of water across cell membranes through aquaporins, this is helpful:{1} The discovery of aquaporin membrane water ...


2

Water across cell membranes occurs due to osmosis( which is based on a concentration gradient). so water diffuses through the cell membrane. sometimes water channels called aquaporins can be found. https://www.anaesthesiamcq.com/FluidBook/fl1_2.php https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/aquaporin In the loop ...


0

Yes, they are action-reaction pair.( Newton’s third law). No, it won’t tear under normal circumstances. The filament withstands all that force because the attractive force between its constituents is far more than the force generated by myosin actin cycle.


1

Action potentials usually maintain muscle tone in skeletal muscles, but muscle cells are affected by other influences that can affect their contraction and thus the tone of the muscle. Smooth muscle occurs in the walls of hollow organs, most notably the blood vessels and the GI tract, and in a few other places. Contraction of smooth muscle is generally ...


0

Disclaimer: it has passed some time since my studies in muscle physiology. Muscle have stretch receptors to monitor the change in length. These are connected to the central nervous system, where information is properly processed and the response triggered. This response, as far as I know, propagates through action potential (AP) across neurons, which ...


1

I am not sure if you are referring to a mechanochemical cycle of "stepping" of a myosin molecule along an actin filament, or a cycle of contraction and relaxation of a muscle cell as a whole. These take place on completely different timescales and control the binding and unbinding of the two proteins in entirely different ways. In the ...


Top 50 recent answers are included