Why is the ulna less movable than the radius?

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Which description provides the best objective summary of the article in the passage?

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?