In circumstances where the body requires prolonged or increased levels of a hormone, the DNA of target cells will specify the synthesis of more receptors on the surface of the cells of the target organ. This is known as ________

A) a stressor reaction
B) sensitivity increase
C) up-regulation
D) cellular affinity


C

Anatomy & Physiology

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Transfer of mRNA from the nucleus to the cytosol occurs through

A) tRNA. B) DNA. C) endocytosis. D) exocytosis. E) nuclear pores.

Anatomy & Physiology

Astronauts in zero gravity are able to move food through their digestive tracts because __________.

A. smooth muscle produces waves of contractions that propel material through the digestive tract B. skeletal muscle puts pressure on the digestive tract C. cardiac muscle maintains a high pressure that moves material through the digestive tract D. striated muscle creates a pressure gradient that forces material from one end of the digestive tract to the other E. skeletal muscle sphincters contract and allow materials to move through the digestive tract

Anatomy & Physiology

The neurilemma of axons in the peripheral nervous system is the outer layer of

A) astrocytes. B) Schwann cells. C) oligodendrocytes. D) microglia. E) ependymal cells.

Anatomy & Physiology

Which of the following most accurately describes the renal transport of Na+?

A. Most of the Na+ transport occurs in the distal convoluted tubule and collecting ducts. B. Primary active transport of Na+ allows for secondary active transport of glucose and H+ in the proximal tubule. C. Na+ is actively transported across the luminal membrane of proximal tubule cells in exchange for K+, by Na+/K+ ATPase pumps. D. Na+ is actively secreted into the nephron lumen by cells in the cortical collecting ducts. E. Na+ is actively transported in all segments of the tubule.

Anatomy & Physiology