(5). Explain why actin filaments are polar and why this is important in muscle c
ID: 256223 • Letter: #
Question
(5). Explain why actin filaments are polar and why this is important in muscle contraction. (2 points) (6). Membrane extension in crawling requires which of the following? Circle ALL that apply. (1 point) (A). bending actin filaments (B). myosin II (C). Arp complex nucleation of new filaments (D), actin polymerization (E). actin depolymerization (7). Muscle contraction requires which of the following? Circle ALL that apply. (1 point) (A). Myosin moves towards the (-) end of actin filaments (B). Calcium is released from the sarcoplasmic reticulum (C). Calcium binds tropomyosin (D). Tropomyosin moves out of the way, allowing myosin to bind actin (E). The sarcomere shortensExplanation / Answer
5.
Actin is a protein that together form microfilaments. These filaments are polar in nature. The polarity in these filaments is important as they cause the movement of the cell. The polarity help in becoming the motile structure also cell division is the important phenomenon that need the polarity. So, actin filaments also help in the cell division.
The most important function of these filaments is muscle contraction. There is the high contraction of the microfilaments in the cells of muscles. The basic unit of muscle cell which is called as myofibrils also form by the microfilaments. Actin works with the myosin protein in to allow the contraction and relaxation of the muscle cells.
6.
Correct: the membrane extension require the frequent polymerization and depolymerization of the actin protein.
7.
Correct: muscle contraction requires calcium binding to tropomyosin and tropomyosin moves out of the way, allowing myosin to bind actin.
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