Cerebellar cortex ridges are called
A) tonsils.
B) folia.
C) vermis.
D) lobes.
Ans: B) folia.
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A certain drug decreases heart rate by blocking a receptor on cardiac pacemaker cells. This drug probably binds to ________ receptors
A) nicotinic cholinergic B) muscarinic cholinergic C) alpha-1 adrenergic D) alpha-2 adrenergic E) beta-1 adrenergic
The most abundant anion in the extracellular fluid is
A. hydrogen. B. chloride. C. acetic acid. D. phosphate. E. negatively charged proteins.
Calcium turns on cross bridges by physically repositioning the troponin-tropomyosin complex to uncover the actin cross-bridge binding sites in
a. skeletal muscle b. cardiac muscle c. smooth muscle d. striated muscle e. all of the above except c
An individual's hematocrit would vary with
A. age. B. sex. C. altitude. D. All of the choices are correct.