What is the function of aldosterone?
It increases both Nat and K+ secretion.
It causes the urine to be more diluted.
It reduces Na* reabsorption and K+ secretion.
It increases Nat reabsorption and K+ secretion.
The Correct Answer is D
A. It increases both Na+ and K+ secretion: Aldosterone increases sodium (Na+) reabsorption and potassium (K+) secretion, but it does not increase the secretion of both ions.
B. It causes the urine to be more diluted. Aldosterone causes the urine to be more concentrated by increasing sodium reabsorption and potassium secretion.
C. It reduces Na+ reabsorption and K+ secretion. Aldosterone actually increases sodium reabsorption and potassium secretion, not reduces them.
D. It increases Na+ reabsorption and K+ secretion. Aldosterone promotes sodium reabsorption in the kidneys and increases potassium secretion, leading to more concentrated urine.
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Correct Answer is B
Explanation
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.
Correct Answer is E
Explanation
A. Urethra: The urethra is a part of the urinary system that carries urine from the urinary bladder to the outside of the body.
B. Ureter: The ureters are tubes that carry urine from the kidneys to the urinary bladder. They are part of the urinary system.
C. Kidney: The kidneys are the primary organs of the urinary system responsible for filtering blood and producing urine.
D. Urinary bladder: The urinary bladder is an organ in the urinary system that stores urine before it is excreted.
E. Liver: The liver is not an organ of the urinary system. It plays a crucial role in metabolism, detoxification, and bile production, but it is part of the digestive system.