During birth, an infant is normally stimulated to breathe by_________________.
surfactant
CO2 accumulating in the infant's blood
prostaglandins
an increased O2 level in the infant's new environment
The Correct Answer is B
A. Surfactant reduces surface tension in the alveoli, aiding in lung expansion, but it does not directly stimulate breathing.
B. CO2 accumulating in the infant's blood: The accumulation of CO2 in the infant's blood is a significant stimulus for the first breath after birth. High levels of CO2 trigger the infant's respiratory centers to start breathing.
C. Prostaglandins are involved in labor and delivery but do not directly stimulate breathing in the newborn.
D. An increased O2 level in the infant's new environment: Increased O2 levels do not directly stimulate breathing; rather, the accumulation of CO2 is the primary stimulus.
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Correct Answer is D
Explanation
A. Corpuscle: The corpuscle refers to the glomerulus and Bowman's capsule, not the medial concavity of the kidney.
B. Cortex: The cortex is the outer region of the kidney, not the medial concavity.
C. Medulla: The medulla refers to the inner part of the kidney but not specifically the medial concavity.
D. Hilum: The hilum is the medial concavity of the kidney where blood vessels, nerves, and the ureter enter and exit.
Correct Answer is A
Explanation
A. The cardiovascular system is primarily involved in transporting blood and nutrients but does not directly excrete waste.
B. The respiratory system: The respiratory system helps excrete carbon dioxide, a waste product of metabolism.
C. The digestive system excretes waste through the process of defecation.
D. The integumentary system (skin) excretes waste through sweat.
E. The urinary system is directly involved in the excretion of waste products through urine.