Answer:
Yes. Cells have 'cell receptors' that are used to receive messengers like hormones to communicate. Cell receptors have specific shapes that fit the shape of the messenger that they want to receive. Organs like the pancreas send our these messengers to the cells to order them to do different functions.
Answer:
i think its B
Explanation:
good luck and may the Lord bless you
B. Systolic is when the heart beats. Diastolic is the heart at rest.
Answer:
A
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