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Physiology Practice

5 MCQs • Practice Free attempt

Practice Test

Physiology — 5 Questions

1
Physiology

Which type of receptors are involved in the contraction of the detrusor muscle during micturition?
1) Muscarinic receptors
2) Adrenergic receptors
3) Dopaminergic receptors
4) Serotonergic receptors

📝 Explanation:

The contraction of the detrusor muscle during micturition is mediated by the activation of muscarinic receptors (specifically M3 receptors) on the smooth muscle cells of the detrusor. This leads to increased muscle tone and the expulsion of urine from the bladder.

2
Physiology

What is the primary function of the cholinergic system in the gastrointestinal tract?
1) Decreases peristalsis and relaxes sphincters
2) Increases peristalsis and relaxes sphincters
3) Increases peristalsis and constricts sphincters
4) Decreases peristalsis and constricts sphincters

📝 Explanation:

The cholinergic system, acting via muscarinic receptors, increases peristalsis and relaxes the sphincters in the gastrointestinal tract to facilitate the movement of food and waste through the digestive system.

3
Physiology

What is the effect of muscarinic stimulation on the pupil of the eye?
1) Dilation (mydriasis)
2) Constriction (miosis)
3) No effect on pupil size
4) Paralysis of the pupil

📝 Explanation:

The pupillary light reflex is under the control of the parasympathetic nervous system, which stimulates muscarinic receptors in the iris sphincter muscle. This leads to pupil constriction (miosis) in response to light, as part of the body's attempt to regulate the amount of light entering the eye.

4
Physiology

What is the effect of stimulating the cholinergic system in the male reproductive system?
1) Decreased testosterone secretion
2) Decreased penile erection
3) Increased testosterone secretion
4) Increased penile erection

📝 Explanation:

Stimulation of the cholinergic system can lead to increased penile erection due to the vasodilation of blood vessels in the penis, allowing for greater blood flow and engorgement of the corpora cavernosa.

5
Physiology

What type of receptors are found in the heart that are stimulated by the parasympathetic nervous system?
1) Adrenergic receptors
2) Muscarinic receptors
3) Nicotinic receptors
4) GABAergic receptors

📝 Explanation:

The parasympathetic nervous system acts on muscarinic receptors (specifically M2 receptors) in the heart to decrease the heart rate and atrial contractility, thereby contributing to a resting state and energy conservation.

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