Lipids are needed by the body: (Select all that apply)
For fluid balance
As component of myelin sheath
Component of hemoglobin
As component of cell membrane
As an energy source
Correct Answer : B,D,E
A. For fluid balance: Lipids do not play a direct role in maintaining fluid balance; electrolytes and plasma proteins like albumin regulate this function.
B. As a component of the myelin sheath: Lipids, particularly phospholipids and cholesterol, are essential for forming the myelin sheath, which insulates nerve fibers and facilitates efficient nerve conduction.
C. Component of hemoglobin: Hemoglobin is composed of iron and protein (globin chains), not lipids.
D. As a component of the cell membrane: Cell membranes are composed of a lipid bilayer (phospholipids and cholesterol), which helps maintain structural integrity and fluidity.
E. As an energy source: Lipids provide a concentrated energy source, yielding 9 kcal per gram, which is more than carbohydrates (4 kcal/g).
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Related Questions
Correct Answer is C
Explanation
A. Serous: Serous membranes line closed body cavities (e.g., pericardium, pleura, peritoneum) and do not open to the exterior.
B. Cutaneous: The cutaneous membrane is the skin, which covers the body but does not line internal passages.
C. Mucous: Mucous membranes line body cavities and passages that are open to the external environment, such as the respiratory, digestive, and urogenital tracts.
D. Synovial: Synovial membranes line joint cavities and produce synovial fluid for lubrication, but they do not line external body passages.
Correct Answer is D
Explanation
A. Epithelial: Epithelial tissue covers body surfaces and lines cavities but does not bind body parts together.
B. Muscle: Muscle tissue contracts to produce movement but does not function primarily to bind structures.
C. Nervous: Nervous tissue transmits signals between the brain and body but does not provide structural binding.
D. Connective: Connective tissue supports and binds different parts of the body. Tendons (attach muscle to bone) and ligaments (connect bones) are key examples.
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