Because cardiac muscles are mechanically, chemically, and electrically connected to one another, cardiac muscle functions as a single enormous fiber, i.e., a ________.
Fill in the blank(s) with the appropriate word(s).
syncytium
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The anterior arch is associated with
A. C1. B. C2. C. the axis. D. b and c
Which of the following happens during atrial systole?
A. The atria then repolarize and relax. B. The increased pressure pushes blood through the AV valves into the atria. C. Blood rushes in from the vena cavae and pulmonary veins to fill the right and left atria. D. The atria depolarize and contract together creating decreased volume and higher pressure in the atria than the ventricles.
Which structure develops from an embryonic pouch that grows upward from the ectoderm of the pharynx?
A. Pineal gland B. Adrenal gland C. Thymus gland D. Adenohypophysis E. Neurohypophysis
A neurotransmitter that increases the permeability for sodium in a postsynaptic neuron causes
A) no changes in the resting potential. B) damage to the myelin sheath. C) excitatory postsynaptic potentials. D) an alteration of the membrane threshold