The neurotransmitter that is responsible for the voluntary movement of muscles in the arm is ACETYLCHOLINE.
Acetylcholine is the neurotransmitter that act at neuromuscular junctions, that is, it is released by the nervous system to activate muscle movement. Muscular contraction is usually initiated by the release of acetylcholine by the nervous system.
Answer:
I believe to fight infection??
Answer:
Gastrovascular Cavity
Explanation:
Hydra is commonly found in freshwater ponds and ditches as solitary organisms, in underside of aquatic leaves and lily pads in cool,clean freshwater pools and streams. It has a *Cylindrical body shape*.
Hydra possesses an internal body cavity, the *Gastrovascular cavity *,lined by gastrodermis and has a single opening,the mouth,which serves as an anus.
The Gastrovascular cavity of Hydra is a site for *digestion and nutrient distribution*,and also serves as anus.
In order for multicellular organisms to maintain homeostasis B. their organ systems must work together. So the answer is letter B. This is because in order for the body to maintain hemostasis, it has to maintain the body temperaturw in any weather and climate it will experience.
Answer:
Vein
Explanation:
Veins are the ones that keep you alive because blood goes inside the vein