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Which kind of membrane surrounds the heart?

A.

synovial membrane

B.

serous membrane

C.

cutaneous membrane

D.

mucus membrane

Answer and Explanation

The Correct Answer is B

A. synovial membrane: Synovial membranes line the cavities of freely movable joints and secrete synovial fluid for lubrication. They do not surround the heart or other internal organs.

B. serous membrane: The heart is surrounded by the pericardium, which is a serous membrane. This double-layered membrane produces serous fluid to reduce friction as the heart beats within the thoracic cavity.

C. cutaneous membrane: The cutaneous membrane refers to the skin, which covers the external surface of the body. It does not enclose internal organs like the heart.

D. mucus membrane: Mucus membranes line body cavities that open to the exterior, such as the respiratory and digestive tracts, and secrete mucus to protect and lubricate surfaces. They are not associated with the heart.


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Related Questions

Correct Answer is D

Explanation

A. melanin:Melanin is the primary pigment responsible for skin color, produced by melanocytes in the epidermis. It provides protection against ultraviolet (UV) radiation and contributes to variations in skin tones among individuals.

B. hemoglobin:Hemoglobin in red blood cells contributes to the pinkish or reddish hue of the skin, particularly in light-skinned individuals, due to oxygenated blood flowing close to the surface.

C. carotene:Carotene is a yellow-orange pigment found in certain vegetables and can accumulate in the skin, especially in the stratum corneum and fatty tissues, influencing skin color.

D. All can contribute to skin color:Skin color is determined by a combination of melanin, hemoglobin, and carotene. The relative influence of each pigment varies, but together they produce the wide range of human skin tones.

Correct Answer is A

Explanation

True:Hyperplasia refers to an increase in the number of cells in a tissue or organ, often in response to a specific stimulus or increased functional demand. It is a controlled process that occurs when additional cells are needed, such as during tissue repair or in response to hormonal signals.

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