Positive feedback: breast feeding, giving birth, and blood clotting are two examples.
Negative feedback: Blood glucose levels, temperature control, and body temperature are two examples.
-Negative feedback: accumulation of an end product of a process slows that process.
-Positive feedback: the end product speeds up its own production. Regulation is important because without it we would bleed out from small cuts because we wouldn't be able to form blood clots. Or we wouldn't be able to form ATP. Regulatory mechanisms help us do the important tasks needed to sustain life.
Hope this helps! :)
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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.
A. Would be the correct answer!
Answer:
The correct answer is A) each of the new double stranded DNA molecules contains one of the original intact strands and one completely new strand.
Explanation:
<u>Semiconservative</u> is one of three types of replication. This particular one takes one original strand from the mother and creates the other one based on the original as a template. When one of the two new chains contains only original material and the other one contains only new material it's called <u>conservative</u> replication. When each strand preserves fragments from the original and creates fragments of new material it's called <u>dispersive</u> replication.
