In ______________, carrier molecules move a substance against (up) the concentration gradient
A. facilitated diffusion
B. simple diffusion
C. endocytosis
D. active transport
E. exocytosis
D
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Which brain structure is responsible for the "startle reflex" in response to loud sounds?
a) Superior colliculus b) Inferior colliculus c) Pontine nucleus d) Medial lemniscus e) Arbor vitae
Which of the following promotes elastic recoil of the lungs?
a. Elastic fibers in the lung b. Surface tension of the fluid lining the alveoli c. Pulmonary surfactant d. Both a and b e. All of the above
The solar plexus is used as a name for the ________.
A. the celiac and mesenteric ganglia B. spinal nerve route C. sympathetic nerve route D. splanchic nerves E. carotid plexus
Interactions between actin and myosin filaments of the sarcomere are responsible for
A) muscle fatigue. B) the conduction of neural stimulation to the muscle fiber. C) muscle contraction. D) muscle relaxation. E) the striped appearance of skeletal muscle.