High- and low-frequency sounds are discriminated chiefly by
a. low frequencies producing stronger vibrations.
b. high frequencies producing larger action potentials.
c. the middle ear bones vibrating more vigorously for low frequencies.
d. low frequencies deflecting the basilar membrane at a greater distance from the oval window.
e. low frequencies setting up fluid vibrations in the perilymph.
D
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Parkinson's disease affects the cerebral basal ganglia, resulting in tremors in limbs, slowness in beginning and completing movements, and other abnormalities of muscle control. The specific population of neurons involved degenerates and thus fails to produce the neurotransmitter dopamine. An obvious treatment option to try is to administer dopamine, yet this is completely ineffective at
alleviating the symptoms. Propose a reason why this treatment fails, and a related alternative to address the dopamine deficit. (Hint: Think about how the brain protects itself from chemicals in the blood.) What will be an ideal response?
As it implants, what is the conceptus nourished by?
A. Trophoblastic nutrition B. Uterine milk C. Nutrient diffusion from the endometrium D. Placenta E. Umbilical nutrition
After 4 to 5 minutes without blood flow, the brain cells are irreversibly damaged.?
Indicate whether the statement is true or false
Answer the following statements true (T) or false (F)
1. The pericardium consists of two layers, the parietal pericardium and the epicardium. 2. Atrial and ventricular systole occur at the same time. 3. Both semilunar valves are attached to the heart wall by chordae tendineae. 4. A damaged chordae tendineae could affect the functioning of the tricuspid valve. 5. The term angioplasty refers to the medical procedure in which a vein from another part of the body is used to direct blood flow around a blocked artery in the heart.