The integumentary system helps to maintain a boundary between the internal and external environment
Give an example of something that is prevented entry to the body and an example of something prevented from escaping the body by the integumentary system.
Answer: The integument prevents entry of pathogens (germs, viruses, bacteria) OR harmful chemicals. The integumentary system prevents water (body fluid) loss.
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The lens of the eye thickens when the
A. ciliary muscles relax. B. ciliary processes relax. C. ciliary muscles contract. D. suspensory ligaments pull on the lens capsule.
Baby Timothy suffers from apnea and is hooked up to a monitor to warn his parents when he stops breathing. Timothy's dad snores very loudly. Timothy's condition differs from his father's in that infant apnea is
A. due to airway obstruction. B. treated by strapping a device onto the nose at night. C. a result of decreased surfactant. D. a central problem of respiratory control.
Which of the following makes up the largest single component of the human body?
a) Skin b) Water c) Blood d) Organs e) Electrolytes
Embryonic skeletons consist primarily of elastic cartilage, which is gradually replaced by bone during development and growth.
a. true b. false