Practice Questions

TLS Online TPP Program

#Question id: 11134

Which of the following statements concerning synaptic transmission is correct?

#Unit 7. System Physiology – Animal

When a specific population of synaptic terminals is spread over the considerable surface of a neuron, their collective effects cannot spatially summate and lead to initiation of an action potential
Even if the successive discharges of an excitatory synapse occur sufficiently close in time, they cannot temporally summate and initiate an action potential
A neuron is “facilitated” when its membrane potential is moved in the less negative or depolarizing direction
Even when rapidly stimulated by excitatory synaptic input for a prolonged period of time, neurons typically do not exhibit synaptic fatigue

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TLS Online TPP Program

#Question id: 34137

#Unit 7. System Physiology – Animal

Which of the following best explains why glucose uptake into liver cells continues in insulin-resistant states, even when skeletal muscle glucose uptake is impaired?

TLS Online TPP Program

#Question id: 34138

#Unit 7. System Physiology – Animal

Which of the following hormones are nanopeptides with a disulfide ring at one end?

TLS Online TPP Program

#Question id: 34139

#Unit 7. System Physiology – Animal

I. Oxytocin and vasopressin are typical neural hormones , that is, hormones secreted into the circulation by nerve cells.

II. Vasopressin and oxytocin each have a characteristic neurophysin associated with them in the granules in the neurons.

III. The precursor for AVP, prepropressophysin , contains a 19-amino-acid residue leader sequence followed by AVP, neurophysin II, and a glycopeptide.

IV. Prepro-oxyphysin, the precursor for oxytocin, is a similar but smaller molecule that lacks the glycopeptide.

TLS Online TPP Program

#Question id: 34140

#Unit 7. System Physiology – Animal

Following stimulus stimulates vasopressin-secreting neurons, EXCEPT?

TLS Online TPP Program

#Question id: 34141

#Unit 7. System Physiology – Animal

I. Oxytocin causes contraction of the smooth muscle of the uterus.

II. The suckling of an infant at the breast stimulates the touch receptors, the nuclei are stimulated, oxytocin is released.

III. The sensitivity of the uterine musculature to oxytocin is enhanced by estrogen.

IV. Progesterone directly stimulates myometrial contraction while simultaneously reducing oxytocin clearance.

TLS Online TPP Program

#Question id: 34142

#Unit 7. System Physiology – Animal

Somatostatin inhibits the secretion of following hormones, EXCEPT?