They are located in the liver the wall of the sinusoids.
Answer:
C) Acetylcholine receptors in the motor end plate
Explanation:
Excitability is the ability of the muscle fiber to produce an electric signal in response to a stimulus. The motor end plate is the region of sarcolemma present opposite to the synaptic end bulbs. It is a muscular region with millions of integral membrane proteins serving as acetylcholine receptors.
The acetylcholine receptors are ligand-gated ion channels and acetylcholine serves as the ligand. Each of the ion channels of acetylcholine receptors is opened by binding of two molecules of acetylcholine. The opening of these ion channels allows Na+ to move across the membrane. The inflow of Na+ makes the inside of the muscle fibers more positive and triggers the firing of the action potential.
Answer:
D. increased blood glucose, decreased GI peristalsis, and increased heart rate and blood pressure
Explanation:
Activation of the sympathetic division under any emergency or stress conditions results in a series of physiological responses collectively referred to as flight or fight response.
The sympathetic nervous system causes an increase in heart rate and blood pressure. Increased pumping of blood through the heart ensures enough supply of oxygen to muscles required to produce the desired responses.
It also causes constriction of blood vessels that supply gastrointestinal tract and reduced muscular activities of smooth muscles of GI trait. The result is reduced blood flow through these tissues, reduced peristalsis and slowing of digestive activities, which are not required during exercise. The sympathetic nervous system also triggers the release of glucose by the liver increases blood glucose level.
