Gastrin; major activities: Stimulates gastric acid secretion and proliferation of gastric epithelium
Answer: Skeletal Muscles
Explanation:
Skeletal muscle is one of the three muscles that is found in the body. Other two types are cardiac and smooth mucles.
It is formed by the striated tissues that are under the voluntary control of the somatic nervous system.
They are attached to the boned by the bundles of collagen fibers. The muscles consists of actin and myosin whose repeated units are known as sarcomere.
This sarcomere provides this muscle the striated appearance.
Universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago.
Completely wipe out one of the other species.
-- CocaBeanz has got your back :)
Answer: Receptor proteins
Why?
Cells have proteins called receptors that bind to signaling molecules and initiate a physiological response. Different receptors are specific for different molecules. Dopamine receptors bind dopamine, insulin receptors bind insulin, nerve growth factor receptors bind nerve growth factor, and so on.