GENERAL HISTOLOGY

Detailed explanation-1: -A metarteriole is a type of vessel that has structural characteristics of both an arteriole and a capillary. Slightly larger than the typical capillary, the smooth muscle of the tunica media of the metarteriole is not continuous but forms rings of smooth muscle (sphincters) prior to the entrance to the capillaries.

Detailed explanation-2: -Thoroughfare capillaries or channels-direct link between arteriole and venule. True capillaries-Flow into them is regulated by pre-capillary sphincters.

Detailed explanation-3: -Blood flow is regulated locally in the arterioles and capillaries using smooth muscle contraction, hormones, oxygen, and changes in pH.

Detailed explanation-4: -The total flow into a muscle is governed by the whole arterial tree from the feeding arteries to the terminal arteries. The specific precapillary sphincters at the junction of arterioles are not present in the microcirculation of skeletal muscles.