Question

Which statement about hormones, hormone-producing cells, and target cells is true? 
a. Cells in close proximity to hormone-producing cells are more strongly affected by the hormone than cells at a distance               
b. All hormones travel in the blood to target cells             
c. Target cells have receptors for binding the hormone they are a target for    
d. Endocrine glands have ducts that lead to the outside of the body             
e. Endocrine cells do not exist as single cells within a tissue

Answer 1

Hormones-All hormones travel in the blood to target cells

In endocrine signaling, signaling molecules, called hormones, act on target cells distant from their site of synthesis by cells of endocrine organs. In animals, an endocrine hormone usually is carried by the blood from its site of release to its target.

Hormone Producing Cells-Endocrine cells do not exist as single cells within a tissue

Endocrine cells are responsible for producing and releasing hormone molecules into the bloodstream. Endocrine cells are typically grouped together in organs referred to as endocrine glands.

In some cases, endocrine cells exist as single cells scattered within a tissue composed mostly of other cells, as in the gut epithelium

Target Cells- Target cells have receptors for binding the hormone they are a target for

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.In very basic terms, binding of hormone to receptor triggers a cascade of reactions within the cell that affects function.

Option a - Cells in close proximity to hormone-producing cells are more strongly affected by the hormone than cells at a distance - wrong

hormones, act on target cells distant from their site of synthesis by cells of endocrine organs

Option d-Endocrine glands have ducts that lead to the outside of the body.-Wrong-

The endocrine glands do not have ducts (and therefore are sometimes called ductless glands)