Biology Forums - Study Force

With a couple of homework problems...

1.) The extent of target cell activation depends on:
a) blood levels of hormone
b) number of receptors on/in target cell
c) affinity of receptor for hormone
d) all of the above
e) A and B
f) none of the above


2.) Hormones
a) are usually produced in large quantities by certain cells
b) usually affect cells nearby the hormone producing cell
c) bind only to those cells that have receptors for that specific hormone
d) are either lipids or polysaccharides
e) A and B
f) A and C

and the last one is.....

Which of the following is not true concerning regulation of hormone secretion?
a) the secretion rate of some hormones is directly controlled by the blood levels of certain chemicals.
b) the secretion rate for some hormones is controlled directly by another hormone
c) secretion of hormones is regulated by positive feedback mechanisms that keep the body functioning within a narrow range of values
d) secretion rate of some hormones is controlled by the nervous system
e) all the above are true



please help me.....

With a couple of homework problems...

1.) The extent of target cell activation depends on:

a) blood levels of hormone
b) number of receptors on/in target cell
c) affinity of receptor for hormone
d) all of the above
e) A and B
f) none of the above


2.) Hormones
a) are usually produced in large quantities by certain cells
b) usually affect cells nearby the hormone producing cell
c) bind only to those cells that have receptors for that specific hormone
d) are either lipids or polysaccharides
e) A and B
f) A and C

Most of these hormones are usually produced in small amounts whenever your body demands this.

and the last one is.....

Which of the following is not true concerning regulation of hormone secretion?

a) the secretion rate of some hormones is directly controlled by the blood levels of certain chemicals.
b) the secretion rate for some hormones is controlled directly by another hormone
c) secretion of hormones is regulated by positive feedback mechanisms that keep the body functioning within a narrow range of values
d) secretion rate of some hormones is controlled by the nervous system
e) all the above are true

Bio_man 8)

Q3, the answer should be C.

Most hormonal secretion are determined by negative feedback mechanism.

??? You're right... definitely a + for you

As an example, the hypothalamus secretes TRH, which causes the pituitary to release TSH, which causes the thyroid gland to secrete T4 (thyroid hormone). When the body has enough thyroid hormone in the blood, T4 "feeds back" to the hypothalamus and pituitary and causes a decrease in secretion of TRH and TSH. This pattern of negative feedback is also true of the ovaries and testes, as well as the adrenal glands.

The only hormonal positive feedback mechanism that I know of is Oxytocin during labour. It is continuously produced to stimulate Prostaglandin to further increase the stretch of the uterine muscle and forces the fetus out of the mother's uterus.

As for Q2, I think the best suited answer is C, not because I entirely agree with it but it's really the best available option. Hormones can bind to non-specific receptors as well. Estrogen can bind to androgen receptor as well.

But lalala, I thought oxytocin was more of a neurotransmitter than a hormone :-\. Thanks for your input though; I hope it's not too late for pregrar :P.

It's actually a hormone but it has a neurotransmitting effect. I had thought it was a neutransmitter too because its more of a signaling molecule but it appears that the general physiologist classified that as a hormone.