The air pressure in the lungs can be increased by
A. increasing the volume of the lungs.
B. decreasing the volume of the lungs.
C. relaxing the diaphragm.
D. contracting the internal intercostals muscles.
E. Both relaxing the diaphragm and by decreasing the volume of the lungs.
Ans: B. decreasing the volume of the lungs.
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Which statement regarding placental circulation is true?
A) Oxygenated maternal blood re-enters the mother's venous system through chorionic villi. B) Maternal and fetal blood mix near the placenta. C) Deoxygenated maternal blood re-enters the mother's venous system through small uterine veins. D) Deoxygenated blood leaves the chorionic villi through umbilical arteries. E) Oxygenated fetal blood enters the chorionic villi through umbilical arteries.
Answer these questions about chromosome structure. What does "B" represent?
A. Chromatid B. Proteins C. Chromatin D. Chromosome E. Centromere
Cell membranes are semipermeable
Indicate whether the statement is true or false
Autorhythmicity in the heart is the responsibility of:
A) contractile cells. B) cardiac pacemaker cells. C) smooth muscle cells. D) skeletal muscle cells.