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

Anatomy & Physiology

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The oxygenated form of hemoglobin is called ________.

A. carbaminohemoglobin B. loaded hemoglobin C. carboxyhemoglobin D. deoxyhemoglobin E. oxyhemoglobin

Anatomy & Physiology

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

Anatomy & Physiology

Cardiac ________ channels are called hyperpolarization cyclic nucleotide (HCN) channels because they open in response to hyperpolarization.

A. ventricular B. pacemaker C. Purkinje D. atrial

Anatomy & Physiology

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.

Anatomy & Physiology