Answer:
By action potential nerve contract the muscle
Explanation:
The muscle contract when the nervous system sends action potential to the muscle. So the nervous system delivers signal to muscle, the first signal reaches the neuromuscular junction. The signals are passed by a chemical messenger called neurotransmitter release by motor neurons, the chemicals bring reaction and shorten the muscle fibre. When neurotransmitter are absent or reduce in concentration the process reverse and muscle relax again.
The ileo-cecal (I-C) valve or sphincter controls the passage of digestive material from the Ileum (small intestine) into the cecum (large intestine).
Answer:independent variable
Explanation:
<span>When a plant undergoes photosynthesis, one of the by-products is oxygen or CO2.
Hope this helps !!! ^_^ !!!</span>
Answer:
the male and female reproductive systems are important so that we can keep the planet populated and have families.
