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In the 16th century, William Harvey discovered evidence that
A) arteries and veins are linked by capillaries. B) the liver manufactures blood. C) blood is recirculated instead of consumed. D) the cardiovascular system is an open system. E) the cardiovascular system transports blood and air.
Answer the following statements true (T) or false (F)
1. Both B lymphocytes and T lymphocytes come from stem cells in the bone marrow. 2. Clones of B cells all share the same surface antibody molecule. 3. By early adulthood, all immature B cells have been activated. 4. Memory B cells outlive plasma B cells. 5. Both T cells and B cells have antigen receptors on their cell membranes.
How can you distinguish the sympathetic from the parasympathetic division of the autonomic nervous system?
A. Origin of the preganglionic neurons B. Neurotransmitters released by the preganglionic neurons C. Sympathetic can be both excitatory and inhibitory D. Presence of peripheral ganglia
Activation of sympathetic nerves that innervate lung tissue results in
A. bronchoconstriction. B. bronchodilation.