Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by what?
A) Active transport
B) Diffusion
C) Filtration
D) Osmosis
Answer: B) Diffusion
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The oxygenated form of hemoglobin is called ________.
A. carbaminohemoglobin B. loaded hemoglobin C. carboxyhemoglobin D. deoxyhemoglobin E. oxyhemoglobin
A major difference between neurotransmitters and hormones is that hormones reach their destination via __.
A. direct contact on their target cell B. cerebrospinal fluid C. ducts D. the blood
Cardiac ________ channels are called hyperpolarization cyclic nucleotide (HCN) channels because they open in response to hyperpolarization.
A. ventricular B. pacemaker C. Purkinje D. atrial
Which of the following is an accurate comparison of skeletal muscle to smooth muscle?
A. Smooth muscle consumes more ATP to maintain a given level of muscle tension. B. Smooth muscle contracts more rapidly but relaxes more slowly. C. Smooth muscle contracts and relaxes more slowly. D. Smooth muscle depends on a nerve fiber to supply the calcium needed for contraction. E. Smooth muscle contracts more slowly but relaxes more rapidly.