In a capillary bed, relaxation of the precapillary sphincter
A. occurs when the tissue in the area does not need more oxygen.
B. causes more blood flow through thoroughfare channels.
C. causes less blood to flow through capillaries.
D. is voluntary.
E. occurs when the tissue in the area needs more oxygen.
Answer: E
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Select the most correct statement regarding nucleic acids.
A) Three forms exist: DNA, RNA, and tDNA. B) DNA is a long, double-stranded molecule made up of A, T, G, and C bases. C) RNA is a long, single-stranded molecule made up of the bases A, T, G, and C. D) TDNA is considered a molecular slave of DNA.
The origins of the muscles that move the foot are on the femur, tibia, or fibula.
Answer the following statement true (T) or false (F)
In a large artery, what structure is immediately inferior to the tunica adventitia?
A) External elastic lamina B) Tunica media C) Vasa vasorum D) Internal elastic lamina
Which chambers contract simultaneously?
A. All chambers contract individually. B. All chambers contract simultaneously. C. Two atria D. Right atrium and right ventricle