MICROANATOMY

Detailed explanation-1: -Both heart rate and myocardial contractility are increased so that the heart pumps more blood per minute. Sympathetic stimulation of vascular smooth muscle causes widespread vasoconstriction, particularly in the organs of the gastrointestinal system and in the kidneys.

Detailed explanation-2: -Smooth muscle cells distributed in the visceral organs are under the control of the autonomic nervous system, and contraction or relaxation of the muscle cells plays an important physiological role in the control of blood pressure, motility of the digestive, respiratory and urinary tracts and secretion.

Detailed explanation-3: -Beta 2 receptors are activated primarily by circulating epinephrine and their stimulation causes relaxation of smooth muscle and vasodilation.

Detailed explanation-4: -parasympathetic nervous system (PNS). The PNS will stimulate the contraction of the smooth muscle found in organs such as the esophagus and stomach via motor neurons, which will propel food and digest material along the digestive tract.