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erma4kov [3.2K]
3 years ago
13

Myocardial cells have long refractory periods in order to ensure each contraction is____. This is

Biology
1 answer:
koban [17]3 years ago
7 0

Answer:These contractile elements are virtually identical to skeletal muscle. ... (a) Cardiac muscle cells have myofibrils composed of myofilaments arranged in sarcomeres, ... The refractory period is very long to prevent the possibility of tetany, a ... At this point, the calcium ion channels close and K+ channels open, allowing outflux ..

Explanation:

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When a fish swims from salt water into fresh water its cells react by losing water and shrinking.​ The correct option is D.

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