In the second-messenger system, what serves as the first messenger?

A) cyclic AMP (cAMP)
B) DNA
C) ATP
D) the hormone
E) mRNA


D

Anatomy & Physiology

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The muscles of the esophagus move food through a rhythmic muscular contraction known as ________.

A. adventitia B. muscularis C. digestion D. peristalsis

Anatomy & Physiology

You would like to see what infections a patient has been fighting recently; one way to do this is to isolate cytotoxic T cells and look into their phagosomes to see what pathogens they have been engulfing through phagocytosis.

Answer the following statement true (T) or false (F)

Anatomy & Physiology

Spermatogenesis and testosterone production are interdependent events, meaning that neither process can occur without the other.

Answer the following statement true (T) or false (F)

Anatomy & Physiology

This figure shows the knee joint. Which number indicates the tibial collateral ligament?

A.  1 B.  2 C.  3 D.  5 E.  6

Anatomy & Physiology