Answer:
I think it's C but it could also be D. In my opinion all of them are complex in their own ways.
Explanation:
<span>Living things are described as having 8 essential characteristics. Therefore, it must have organized cells, etc. But most importantly, it must be able to reproduce. The brain in unable to reproduce, as it is only part of a living organism. :) I hope this helps.</span>
Answer:
the major source is moving water. option 3
A. large-chain fatty acids are formed into lipoproteins for transport in the blood.
The complete question is :
Which of the following best describes how ACh changes the ion permeability of the sarcolemma?
A) ACh activates acetylcholinesterase.
B) ACh entry into the axon terminal causes neurotransmitter release.
C) ACh binds to receptors in the junctional folds.
D) ACh entry into the muscle fiber causes Ca2+ to be released by the sarcoplasmic reticulum.
Answer:
C) ACh binds to receptors in the junctional folds.
Explanation:
Sarcolemma is the term used for the cell membrane of the skeleton muscle fiber cell.
At the motor end plate, there are several folds present in the sarcolemma that are known as junctional folds.
These junctional folds have several acetylcholine (Ach) receptors present on them and these are ion channels that are chemically gated.
These ion channels open upon binding of Ach and thus, the ions can diffuse into the sarcolemma.
Thus, the binding of Ach on the receptors located in the junctional folds increases the ion permeabiltity of the sarcolemma.
