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Which of the following is the name for the shaft of a long bone?

A.

Diaphysis

B.

Periosteum

C.

Cortex

D.

Osteoid

Answer and Explanation

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 C

Explanation

A. Natural passive immunity occurs when antibodies are passed from mother to child, either during pregnancy or through breast milk. This is not related to having the disease.

B. Artificial passive immunity is the transfer of antibodies from an external source, such as through antibody-containing blood products, to provide immediate protection against a disease.

C. Natural active immunity is acquired when an individual is exposed to a pathogen and the immune system responds by producing antibodies and memory cells. This type of immunity occurs after contracting the disease.

D. Artificial active immunity is gained through vaccination, where a person is exposed to a harmless form of the pathogen (such as inactivated or attenuated form), prompting the immune system to create a defense without causing illness.

Correct Answer is A

Explanation

A. The plasma membrane, also known as the cell membrane, surrounds the cell and encloses the cytoplasm. It acts as a barrier, controlling the movement of substances in and out of the cell.

B. The Golgi apparatus is an organelle that modifies, sorts, and packages proteins and lipids for transport, but it does not enclose the cytoplasm.

C. The endoplasmic reticulum is involved in the synthesis of proteins and lipids within the cell but does not enclose the cytoplasm.

D. The flagellum is a tail-like structure that helps some cells move but does not enclose the cytoplasm.

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