Changes in PO2 are recognized/sensed by:
A. central chemoreceptors
B. peripheral chemoreceptors
C. pulmonary mechanoreceptors
D. the blood-brain barrier
ANS: B
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Which of the following explains the occurrence of a hip fracture rather than a hip dislocation?
A) There is a severe lack of capsular fibers in hip joints compared to other synovial joints. B) Only three ligaments are present in hip joints to provide stability. C) Stress gets transferred from head of femur to the diaphysis via the thin neck. D) Muscles surrounding the hip joint are altogether small and thus provide little stability. E) All of the above.
The key difference between fetal hemoglobin and adult hemoglobin is that fetal hemoglobin has a lower affinity for oxygen because the levels of oxygen in placental blood is 2 to 3 times higher than other systemic arteries.
Answer the following statement true (T) or false (F)
During resting normal pulmonary ventilation, ALL of the following is TRUE EXCEPT:
a. excitatory signals reach the diaphragm via the phrenic nerve making it contract b. pressure in the lungs decrease below atmospheric pressure during expiration c. lung volume increase and pressure decreases during inspiration d. relaxing the inspiratory group muscles induces normal quiet expiration
When a year has passed without menstruation, a woman has reached menarche
Indicate whether the statement is true or false