Answer: control what goes in and out of the cells , it allows needed nutrients
Explanation:
Answer:
C. tetanic contractions might occur, which would stop the heart's pumping action.
Explanation:
The absolute refractory period of the cardiac muscle action potential refers to the time interval when the voltage gated sodium channels are inactivated. The absolute refractory period lasts ~180 msec. The action potential lasts 200-220 msec.
The refractory period of cardiac muscle is dramatically longer than that of skeletal muscle. This prevents tetanus from occurring and ensures that each contraction is followed by enough time to allow the heart chamber to refill with blood before the next contraction.
In order words, It is important for the cardiac muscle cells to have a longer refractory period, because if they were short like the skeletal muscles, the heart could enter tetanic contraction/summation which is when muscle is stimulated so rapidly that it does not have a chance to relax at all between stimuli.
It is difficult to place Marella in any of the sub phylum of living arthropods because living arthropods have branched or no antennae while the Marella have branched legs and unbranched antenna. <span />
The Ancient Greeks catalogued rocks and minerals
Out of the following given choices;
a. fructose
b. glycogen
c. sucrose
d. starch
The answer is; B.
Glycogen is only found in animals, bacteria and some fungi. It is analogous to starch (amylopectin) in plants and is also made up of glucose and sucrose polymers. It is highly branched and compact in structure than starch. Glycogen is used as a storage reserve for excess glucose in animals and is stored mainly in the liver and muscles.
