An age-related decline in mental function characterized by difficulties with spatial orientation, memory, language, and personality is called
A) delirium agitans.
B) senile dementia.
C) persistent vegetative state.
D) somnolence of the aged.
E) progressive cerebral dysfunction.
B
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Which statement is NOT true regarding cardiac muscle?
A) Cardiac muscle cells must obey the all-or-none law of contraction. B) Calcium-induced calcium release is the process by which extracellular Ca2+ triggers the release of stored Ca2+ from the sarcoplasmic reticulum. C) Intercalated disks contain both desmosomes for firm attachment and gap junctions to allow communication. D) Cardiac muscle cells rely on a sarcoplasmic reticulum for storage of Ca2+ ions. E) The oxygen demand of cardiac muscle cells is high because they have many mitochondria.
A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.
Answer the following statement true (T) or false (F)
Blood vessels enter the eye and nerve processes exit the eye at the ________.
A. pupil B. sensory retina C. optic disc D. macula lutea E. fovea centralis
Isovolumetric contraction is the phase of the cardiac cardiac cycle in which
a) the semilunar valves are open. b) ventricular repolarization occurs. c) atrial depolarization occurs. d) oxygenated blood leaves the heart into the systemic circulation. e) ventricular pressure increases and ventricular volume remains the same.