16 Questions
What is the role of oxytocin in response to the dilation of the cervix?
It stimulates uterine contraction
How does the number of receptors for a hormone affect the maximal response?
Increase in the number of receptors leads to an increase in maximal response
What does sensitivity refer to in the context of hormonal response?
The responsiveness of a target tissue to a hormone
How does increasing hormone concentration affect the doseresponse relationship?
It usually increases the response and then levels off
Where are the cell bodies of hypothalamic neurons located?
In the median eminence of the hypothalamus
How are hypothalamic-releasing hormones transported to the anterior pituitary?
Through hypothalamichypophysial portal blood vessels
Where do the hormones secreted by the posterior pituitary enter after release from the nerve terminals?
Fenestrated capillaries
Which organ is NOT a target tissue for oxytocin?
Pancreas
What is the term for a decrease in the number or affinity of receptors for a hormone?
Down-regulation
Which family of membrane-bound proteins couples hormone receptors to effector enzymes?
G proteins
What is the major hormone concerned with the regulation of body fluid osmolarity?
Antidiuretic hormone (ADH)
What does an increase in water permeability of principal cells in the late distal tubule and collecting duct via V2 receptors result in?
Increased water reabsorption
What is the primary function of negative feedback in hormone regulation?
To inhibit further secretion of the hormone
Where is oxytocin synthesized in the hypothalamus?
Paraventricular nuclei
Which neural mechanism causes secretion of catecholamines from the adrenal medulla?
Preganglionic sympathetic nerves
What is the effect of estrogen on the secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) by the anterior pituitary?
Stimulates their secretion
Test your knowledge on the hormonal regulation of uterine contraction and the role of oxytocin. Explore the relationship between dilation of the cervix, secretion of oxytocin, and uterine contraction. Also, learn about the impact of hormone receptors on target tissue response.
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