Human Anatomy and Physiology : Help with Fluid Homeostasis Physiology

Study concepts, example questions & explanations for Human Anatomy and Physiology

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Example Questions

Example Question #1 : Lymphatic Physiology

Which of the following is a function of the lymphatic system?

Possible Answers:

Maintain normal blood pressure by secreting enzymes

Maintain composition of body fluids within normal limits

Return excess interstitial fluid to blood

Secretion of endocrine hormones

Control red blood cell production

Correct answer:

Return excess interstitial fluid to blood


The correct answer is returns excess interstitial fluid to blood. The other choices are functions of the urinary system, not the lymphatic.

The lymph capillaries in the lymphatic system pick up excess interstitial fluid and proteins and becomes lymph. If excess fluid is built up in the tissue spaces, blood volume and pressure will decrease. The lymph is returned to the blood in the veins (venous blood) to prevent this from occurring and also to minimize edema (swelling) from the fluid build-up.

The other choices are functions of the urinary system. Red blood cell production is controlled with the secretion of the hormone erythropoietin. Blood pressure is regulated by the secretion of the enzyme renin. The volume and composition of body fluids is maintained within normal limits by regulating the amount of water excreted in urine. The urinary system also acts to maintain concentrations of electrolytes in fluids and normal pH of blood.

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