The effect nervous system has on the heart rate is
Stimulation by parasympathetic nerves causes the heart rate to slow down.
The two branches of the autonomic (involuntary) nervous system regulate heart rate. The parasympathetic nervous system and the sympathetic nervous system (SNS and PNS) (PNS). To increase heart rate, the sympathetic nervous system (SNS) produces the catecholamines epinephrine and norepinephrine. The hormone acetylcholine is released by the parasympathetic nervous system (PNS) to reduce the heart rate. Your heart rate may briefly increase due to stress, coffee, and excitement, whereas it may temporarily decrease due to meditation or deep, steady breathing. Any amount of exercise will raise your heart rate, which will stay up as long as you keep exercising.
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If there aren't leaves there is no photosynthesis. Photosynthesis makes food. Leaves has clorplasts in them which make food from light and Co2
Answer:
I would probably need to see the question, but if this is Edgenuity, then check all of them off.
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Hormones are chemical messengers transported by the bloodstream that can have different effects should be the correct answer for the question
