Chapter 17-Functional Organization of Endocrine System

Ace your homework & exams now with Quizwiz!

A hormone that travels as a bound hormone can bind to any binding protein.

False

A receptor is optional, and used to maximize the response, in order for a target cell to respond to its hormone.

False

Binding proteins shorten the half-lives of the hormones to which they are bound.

False

Glandular secretions such as breast milk, sweat, or enzymes used in digestion are produced by the endocrine system.

False

Hormones must always act on tissues nearby to their point of secretion.

False

Lipid-soluble hormones, which bind to nuclear receptors, produce a faster response than water-soluble hormones that stimulate secondary messengers

False

Membrane-bound receptors interact with lipid-soluble hormones.

False

Once a hormone is bound to a binding protein, it cannot detach from it.

False

Phosphorylase activity removes a phosphate from GTP.

False

Steroid hormones are water-soluble.

False

The activity of the G protein mainly resides in the beta subunit.

False

The levels of free hormones tend to be more stable than those of bound hormones

False

The mRNA molecule moves from the cytoplasm to the nucleus and binds to a ribosome where it directs the synthesis of specific proteins.

False

A negative feedback loop is a process in which the body senses a change, and activates mechanisms to reverse that change.

True

A positive feedback loop causes a self-amplifying cycle where a physiological change leads to even greater change in the same direction.

True

Amplification is more efficient than the process of hormones binding to nuclear-bound receptors.

True

Amplification is the process of one hormone activating multiple proteins, each which activates many enzymes, which produce an enormous amount of the final product.

True

An increase in follicle-stimulating hormone causing an increase in luteinizing hormone receptors in ovary cells is an example of up-regulation.

True

Bound hormones provide a more stable supply of hormones than free hormones.

True

Epinephrine and norepinephrine are examples of water-soluble hormones.

True

Free hormones act on their target tissues immediately after being delivered from the blood.

True

Hormone amplification is faster than the process of hormones binding to nuclear-bound receptors.

True

Inactivation of the alpha subunit occurs when its own phosphorylase activity removes a phosphate from the GTP.

True

One way that the body can prevent down-regulation is through releasing brief pulses of a hormone at intervals; this ensures that the target cell will not become "saturated" with the hormone and decrease its response.

True

Steroid hormones travel in the blood attached to protein carriers.

True

The alpha subunit's separatism from the remainder of the G-protein can be repeated as long as the ligand is bound to the receptor.

True

The hypothalamus plays a role in both the nervous system and the endocrine system.

True

The tendency for one hormone to bind to only one type of receptor is called specificity.

True

The ultimate result of lipid-soluble hormones on cells is the production of proteins.

True

Water-soluble hormones are usually large.

True

Water-soluble hormones cannot usually pass through the cell membrane.

True

When concentrations of a free hormone decrease, some bound hormones will detach, creating a stable level of that hormone in the blood.

True


Related study sets

Chapter 13: Eye Assessment for Advanced and Specialty Practice

View Set

CGS 2060 Final; File Management and Email

View Set

AP BIO REVIEW (unit 6), AP BIO - Unit 6 test

View Set

Political Science 1000 chapter 2: Political Ideologies

View Set

Division: 18 divided by 3 equals 6; 20 divided by 4 equals 5; 16 divided by 2 equals 8

View Set

ch 13: export controls and sanctions

View Set