What is the most abundant cation in the ICF?
K+
Ca 2+
Cl-
Na
The Correct Answer is A
A. K+: Potassium (K+) is the most abundant cation in the intracellular fluid (ICF). This is the correct answer.
B. Ca2+: Calcium (Ca2+) is not the most abundant cation in the ICF; it is found in lower concentrations within cells compared to potassium.
C. Cl-: Chloride (Cl-) is the most abundant anion in the extracellular fluid (ECF), not in the intracellular fluid.
D. Na: Sodium (Na) is the most abundant cation in the extracellular fluid (ECF), not in the intracellular fluid.
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Correct Answer is C
Explanation
A. Posterior pituitary releases hormones such as ADH (antidiuretic hormone), but it does not have aldosterone receptors.
B. Proximal convoluted tubule is involved in reabsorption, but it does not have aldosterone receptors.
C. Distal convoluted tubule: Aldosterone receptors are found in the cells of the distal convoluted tubule. Aldosterone increases sodium reabsorption and potassium excretion in this part of the nephron, which helps regulate blood pressure and electrolyte balance.
D. Adrenal medulla produces catecholamines (e.g., adrenaline) but does not contain aldosterone receptors.
Correct Answer is A
Explanation
A. Uterine tube: Fertilization typically occurs in the uterine tube (also known as the fallopian tube). The sperm travels from the cervix through the uterus and into the uterine tube, where it meets and fertilizes the egg.
B. Uterus: The uterus is where the fertilized egg implants and develops into a fetus, but it is not where fertilization occurs.
C. Ovary: The ovary is where eggs are produced and released during ovulation, but fertilization does not occur here.
D. Urinary bladder: The urinary bladder is part of the urinary system, not the reproductive system, and has no role in fertilization.