MICROANATOMY

Detailed explanation-1: -Answer and Explanation: As blood enters the artery, the walls of these vessels expand and contract, which can be felt as the pulse where the arteries runs close to the body surface. It is common to detect the pulse with a few fingers placed on the radial artery on the wrist, or the carotid artery in the neck.

Detailed explanation-2: -Pulse is defined as the alternate expansion and recoil of an artery. With each heartbeat, blood is forced into the arteries causing them to dilate (expand). Then the arteries contract (recoil) as the blood moves further along in the circulatory system.

Detailed explanation-3: -A decrease in oxygen pressure in arteries causes vasodilation of the cerebral arteries; however, an increase in oxygen pressure in arteries does not cause vasoconstriction.

Detailed explanation-4: -Tunica intima: The inner layer touches your blood and keeps it flowing smoothly through your arteries. Media: The middle layer is elastic, so it expands and contracts to maintain the right blood pressure in your arteries.