When a person loses consciousness, working memory is interrupted and memories are abolished for all that happened for a variable period of time before the blow that caused unconsciousness. Why?
A. The traumatic blow to the head caused a concussion through violent displacement of the brain in the skull.
B. There was a deficiency of adequate blood flow to the brain.
C. There was an interruption in the constant stream of neuron potentials to memory facilitation brain areas.
D. Conflicting external interference prevents conversion of short-term to long-term memory.
E. This is an area of neurological research that has not achieved any satisfying conclusions at the present time.
C
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The cardiac sphincter is innervated by parasympathetic axons coming from the _______ plexus
A. esophageal B. abdominal aortic C. pulmonary D. hypogastric E. cardiac
Why does damaged cartilage heal slowly?
A) Chondrocytes cannot be replaced if killed, and other cell types must take their place. B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury. C) Damaged cartilage becomes calcified, thus blocking the movement of materials required for healing. D) Chondrocytes divide more slowly than other cell types, delaying the healing process. E) Damaged collagen cannot be quickly replaced, thus slowing the healing process.
The primary salt in sweat is ____
a. potassium chloride b. sodium chloride c. sodium bromide d. calcium chloride
The product of the stroke volume times the heart rate is known as the
A. end-diastolic volume. B. end-systolic volume. C. cardiac output. D. cardiac reserve. E. venous return.