The main factor determining male fertility is the:
size of the sperm.
number of sperm ejaculated.
shape of the sperm.
motility of the sperm.
The Correct Answer is B
A. size of the sperm: While sperm size is relatively uniform, it is not the primary diagnostic factor for fertility.
B. number of sperm ejaculated: Sperm count is the most critical factor; if the count falls below a certain threshold (typically 20 million/mL), the statistical likelihood of fertilization drops significantly.
C. shape of the sperm: Morphology is important, but count (quantity) is generally considered the primary limiting factor.
D. motility of the sperm: Motility (swimming ability) is crucial, but it is often secondary to the total count in initial fertility assessments.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Hepatic artery: This carries oxygenated blood to the liver from the heart.
B. Hepatic vein: This carries deoxygenated blood away from the liver toward the heart.
C. Portal vein: Also called the hepatic portal vein, this unique vessel collects nutrient-rich blood from the digestive organs and delivers it directly to the liver for processing.
D. Renal artery: This carries blood to the kidneys.
Correct Answer is B
Explanation
A. Proteins: Proteins are one of the four major classes of organic (carbon-based) molecules in the body.
B. Salts: Salts (like NaCl) are inorganic compounds because they typically do not contain carbon-hydrogen bonds.
C. Lipids: Lipids (fats) are a major group of organic substances essential for cell membranes and energy.
D. Nucleic acids: DNA and RNA are organic molecules that carry genetic information.
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