How does the dorsal blood vessel of the earthworm pump blood?
A) Contractile skeletal muscle surrounding the vessel
B) Peristalsis
C) Contractile chamber
D) It doesn't pump blood. Blood flow is passive.
Answer: B
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In IgG, the antigen binding site is formed by the
A) variable segment of the light chain. B) variable segment of the heavy chain. C) constant segment of the heavy chain. D) variable segments of both the light and heavy chains. E) ionized segment of the light chain and the isotropic segment of the heavy chain.
The major site of sympathetic blood flow control (resistance changes) is at the
a. arterioles. b. capillaries. c. metarterioles. d. arteries. e. none of these answers.
The ________, or chin, tends to be more pointed in females and more "squared-off " in males.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a feature that distinguishes active transport from facilitated diffusion?
A. saturation of transport rate B. requirement for a carrier molecule C. carrier molecules have specificity D. presence of a transport maximum E. requirement for metabolic energy