20 Which of the following neurons is be adrenergic most like

20. Which of the following neurons is be adrenergic? most likely to A) postganglionic somatic motor postganglionic parasympathetic ganglionic sympathetic tganglionic sympathetic preganglionic parasympathetic 21. An injection of epinephrine would increase heart rate, increase blood pressure, decrease gastric tract motility. gastric motility, increase blood pressure. decrease heart rate, decrease decrease heart rate, decrease blood pressure, increase gastric tract motility. have no effect on the heart or the Gl tract. tract motility 22. Beta-blockers blocking agents) are frequently used to A) prevent decreases in heart rate. B) dilate the pupils of the eye. Na C) prevent increases in heart rate. D) cause vasoconstriction. E) block muscarinic receptors. 23. Removal of the anterior pituitary would affect the functioning of the A) kidney. B) adrenal medulla. pancreas. C pancreas isles of Langerhans in the hyroid gland 24. Which of the following occurs when the parasympathetic system is stimulated? A) decreased motility of the digestive tract B increased blood pressure ncreased motility of the digestive tract increased metabolism D) E) increased heart rate

Solution

20.Which of the following neuron is most likely to be adrenergic

Ans.(D) postganglionic sympathetic

In the sympathetic division neurons are mostly adrenergic i.e.epinephrine and norepinephrine functions as the primary neurotransmitter.

21.An injection of epinephrine would-

Ans.(A) increase heart rate,increase blood pressure,decrease gastric tract motility

Epinephrine binds to the beta-adrenergic receptors on the heart muscle cells which causes the contraction rate of the heart to increase thus leading to increased blood supply to the tissues.

22.Beta blockers are frequently used to-

Ans.(C) prevent increase in heart rate

Beta blockers blocks the release of stress hormones adrenaline and noradrenaline resulting in slowing of the heart rate and reduces the force at which the blodd is pumped to the body

23.Removal of anterior pituitary would affect the functioning of-

Ans.(D)thyroid gland

24.Which of the following occurs when the parasympathetic system is stimulated

Ans.(C)increased motility of the digestive tract