Examples of physical barriers against pathogens include all of the following except
A) sebaceous glands.
B) mucus.
C) epithelia.
D) epidermal layers.
E) blood.
Answer: E
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Which term best describes the concentration gradients for sodium and potassium on an excitable cell?
Fill in the blank(s) with the appropriate word(s).
When a muscle relaxes,
A. crossbridges form and muscle extensibility returns the muscle to rest length. B. crossbridges form and muscle elasticity returns the muscle to rest length. C. crossbridges stop forming and muscle elasticity returns the muscle to rest length. D. crossbridges stop forming and muscle extensibility returns the muscle to rest length
In your laboratory experiments, you most often observed ________
A) isometric contractions B) neither isotonic nor isometric contractions C) both isotonic and isometric contractions D) isotonic contractions
Which of the following is NOT true about the fetal stage of development?
A. The head is disproportionately large compared to the rest of the body at the beginning of the stage. B. It includes the blastocyst and morula stages. C. The organ systems are mostly formed, although immature. D. It begins 8 weeks after fertilization.