Which of these muscles can both elevate and depress the scapula
a. rhomboideus major and minor
b. levator scapulae
c. serratus anterior
d. trapezius
e. pectoris minor
Answer: d. trapezius
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Macrophages that migrate to the epidermis to guard against pathogens are known as __________ cells.
Fill in the blank(s) with the appropriate word(s).
Which of the following is an adaptation to bipedal locomotion?
A. An S-shaped spine B. A C-shaped spine C. A funnel-shaped thorax D. A foramen magnum oriented more posteriorly relative to quadrupeds E. A triangular nasal aperture
Lymph is similar to blood plasma, but very low in ________.
A. protein B. carbon dioxide C. sodium and potassium D. metabolic waste E. electrolytes
Amplification of a second-messenger cascade can take place at which level of a signal cascade?
A. One activated receptor can activate numerous G-proteins. B. One activated G-protein can activate numerous effector enzymes. C. One active effector enzyme can catalyze numerous reactions. D. One activated protein kinase can allosterically modulate numerous proteins. E. All of the choices are correct.