The most powerful muscle in the body is the ________
A) gluteus maximus
B) rectus abdominis
C) gastrocnemius
D) quadriceps femoris
D
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Which applies to the classical complement pathway, but NOT to the alternative complement pathway?
A. Complement activation leads to the development of a multiunit protein called the membrane attack complex (MAC). B. There is a cascade of proteins activated, which results in the killing of microbes. C. Antibodies activate the first complement protein (C1). D. Complement proteins serve as opsonins that facilitate phagocyte binding to microbes. E. Activation of C3 results in the formation of C3b.
Which of the following arteries supplies blood to the primary sex organs?
A) renal B) inferior phrenic C) adrenal D) gonadal
What second messenger most directly causes calcium ions to be released from intracellular stores?
A. Phospholipase A B. Phospholipase C C. Diacylglycerol D. Adenylyl cyclase E. inositol trisphosphate
Why do some normal cells fail to respond to a chemical signal?
A) Some cells are completely without ligands. B) Signal chemicals often break down before reaching a distant target. C) Chemical signals are only delivered to specific cells. D) Some cells are completely without receptors. E) Some cells lack the necessary receptors.