Describe how the newborn's first breath alters the circulatory pattern.
What will be an ideal response?
Ans: The first breath inflates the lungs, which drops blood pressure throughout the pulmonary system, as well as in the right atrium and ventricle. In response to this pressure change, the flow of blood temporarily reverses direction through the foramen ovale, moving from the left to the right atrium, and blocking the shunt with two flaps of tissue. The increased oxygen concentration also constricts the ductus arteriosus, ensuring that these shunts no longer prevent blood from reaching the lungs to be oxygenated.
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Answer the following statements true (T) or false (F)
1. The male urethra serves the urinary system only. 2. Both tetrads and crossovers are seen during meiosis. 3. Failure to attain erection is called impotence. 4. Ovulation occurs near the end of the ovarian cycle. 5. The corpus luteum secretes progesterone only.
In the somatic nervous system, how many neurons run from the CNS to the effector organ?
a. one b. two c. three d. four e. five
As compared to teenagers' spinal nerves, how specialized are their cranial nerves?
A) More specialized B) Equally specialized C) Less specialized D) Depends upon maturity
In order to accommodate the large liver,
A. the right kidney is about 2 centimeters inferior to the left kidney. B. the left kidney is about 2 centimeters inferior to the right kidney.