Which of the following is the name for the shaft of a long bone?
Diaphysis
Periosteum
Cortex
Osteoid
The Correct Answer is A
A. The diaphysis is the shaft of a long bone, the central part that extends between the two epiphyses (ends). It is primarily composed of compact bone and houses the bone marrow.
B. The periosteum is a dense layer of connective tissue that covers the outer surface of bones, except at the joints. It does not represent the shaft of the bone.
C. The cortex refers to the outer layer of the bone, specifically the compact bone that surrounds the spongy bone in the diaphysis. It is not synonymous with the shaft.
D. Osteoid is the organic matrix of bone tissue, composed of collagen and other proteins, but it does not refer to the shaft of a bone.
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Related Questions
Correct Answer is D
Explanation
A. The ejaculatory ducts are formed by the union of the vas deferens and the seminal vesicles. Seminal fluid does not enter the ejaculatory ducts directly after leaving the epididymis.
B. The prostate gland contributes fluids to seminal fluid but is not the direct next location for the fluid after leaving the epididymis.
C. The seminal vesicle produces fluid that combines with sperm to form semen, but it is not the immediate next structure after the epididymis.
D. The vas deferens is the tube that transports sperm from the epididymis to the urethra. After leaving the epididymis, seminal fluid enters the vas deferens.
Correct Answer is D
Explanation
A. Hydrochloric acid is a strong acid produced in the stomach to aid in digestion, not a byproduct of glucose breakdown.
B. Ketotic acid is produced in conditions where fat metabolism predominates, especially during ketosis, not during anaerobic glucose breakdown.
C. Carbonic acid forms when carbon dioxide dissolves in water and is not related to glucose metabolism.
D. Lactic acid is produced during anaerobic respiration when glucose is broken down without sufficient oxygen. This occurs in muscles during intense exercise, leading to the accumulation of lactic acid, which causes the sensation of muscle fatigue. This is the correct answer.
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