28 notecards = 7 pages (4 cards per page)
The endocrine system
B) secretes chemicals that reach their targets through the bloodstream
Hormones are intercellular chemical signals that
C) help coordinate growth, development and reproduction.
Most endocrine glands communicate with their target tissues using _____ signals.
An intercellular chemical signal that is produced by neurons but functions like a hormone
Given the following list of organic molecules, which includes hormones? 1. nucleic acid
C) 2, 3, 4
Hormonal secretion can be regulated by
D) all of the above.
Secretion of TSH (thyroid-stimulating hormone) is regulated by
C) the action of other hormones.
An example of a situation where the nervous system regulates the rate of hormonal
E) sympathetic neurons stimulate the release of epinephrine.
Which of the following statements regarding hormone transport and distribution is false?
C) Plasma protein concentration has no influence
The half-life of a hormone allows one to determine
C) the rate at which hormones are eliminated from the body.
Receptors for most water-soluble hormones are located
B) on the plasma membrane of their target cells.
Which of the following is a regulatory protein associated with membrane-bound receptor
D) G protein
A hormone binds to its receptor. Arrange the events that follow in correct sequence.
D) 5, 4, 2, 1, 3
B) produces an increase in the sensitivity of the target cell to the hormone.
Hormone receptor molecules may be ____ in order to change the target cell's sensitivity
E) A, B, C
In some forms of diabetes, an insensitivity to insulin seems to be present. This
Once a hormone is conjugated in the liver
B) it can be rapidly eliminated.
Hormones with short half-lives
E) regulate activities of rapid onset and short duration.
How do hormones and target cells recognize one another?
C) by the presence of specific receptor molecules on the target cells
The role of cAMP when it acts as an intracellular mediator in cells is to
A) bind to and activate protein kinase.
When a hormone binds to a membrane–bound receptor,
B) cyclic GMP might be produced to act as an intracellular mediator.
B) to inactivate cyclic AMP.
Arrange the following events in proper sequence:
B) 1, 4, 3, 2
Consider the following events in the intracellular receptor model:
B) 1, 3, 4
B) diffuse easily through the plasma membrane.
Which of the following occurs when a hormone binds to an intracellular receptor?
B) activation of mRNA synthesis
When a few intracellular mediator molecules activate several enzymes and each of these
A) a cascade effect.
Which of the following events occurs last?
C) Calmodulin binds to the enzyme that phosphorylates myosin and cross-bridges form.