Most of growth hormone’s growth-promoting effects are actually carried out indirectly by:

Which group of hormones is lipid-soluble and therefore able to diffuse through the plasma membrane to bind intracellular receptors that directly activate genes?

The hypothalamus controls secretion by the anterior pituitary primarily by:

Compared with the nervous system, the endocrine system characteristically produces responses that are:

In iron-deficiency anemia, the red blood cells produced are called microcytes, meaning they are:

Persistently high blood levels of a hormone often cause target cells to lose receptors for that hormone, desensitizing the target. This phenomenon is called:

Glucagon and epinephrine both cause the liver to release glucose, and together their combined effect is greater than the sum of either acting alone. This interaction is best described as:

Which muscle tissue is described as voluntary and striated, and is composed of long, multinucleate cells called muscle fibers?

The hypodermis (subcutaneous layer) lies deep to the skin and anchors it to underlying structures. Although not technically part of the skin, it absorbs shock and insulates because it is composed mostly of:

Oxygen, carbon dioxide, and steroid hormones move across the plasma membrane by dissolving directly through the lipid bilayer, with no carrier and no energy required. This process is called: