Admin Table of Contents
What is the major target organ of growth hormone?
The thymus gland
The thymus gland: a target organ for growth hormone.
Which hormones have target cells?
For instance, steroid hormones, like the sex hormone groups estrogens and androgens, seek out specific target cells and bind to receptor proteins located inside the nucleus of the cell, as shown below.
What does Stot Se 3 mean?
STOT-SE Category 3 includes only respiratory tract irritation (sore throat, cough) and narcotic effects (dizziness, drowsiness). Category 3 respiratory tract irritants cause irritant effects that impair function with symptoms such as cough, pain, choking, and breathing difficulties.
How are hormones transported to their target organs?
The hormones then diffuse to the bloodstream via capillaries and are transported to the target cells through the circulatory system. This allows hormones to affect tissues and organs far from the site of production or to apply systemic effects to the whole body.
How do most hormones get to their target?
Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are called target cells. A target cell responds to a hormone because it bears receptors for the hormone.
How do the hormones reach their target tissue?
Because only those target cells have receptors for that particular hormone. Some hormones bind to receptors on the surface of target cells. Others enter the cells and bind to receptors in the cytoplasm or nucleus.
How do hormones change their target cells?
Hormones are “signaling” molecules because they influence the activity of other cells that may be far from where the hormone was produced. For a hormone to affect a target cell, it must attach to a receptor protein on the target cell membrane or inside the cell.