Shudent: 1. Cartilage heals slowly after an injury because A. this tissue type i

Question

Shudent: 1. Cartilage heals slowly after an injury because A. this tissue type is very complex. B. it contains so much proteoglycan. C. it has few, if any, blood vessels D. it is a dead, rather than a living, tissue E. it contains no fibroblasts. 2. Receptor-mediated endocytosis A. does not need ATP; the receptors supply the energy. B. exhibits specificity C. occurs if oxygen is available. D. is a type of passive transport E. moves materials out of the cell. 3. A researcher discovered a sensory receptor that detects decreasing oxygen concentrations in the blood. According to the principles of negative feedback, it is likely that stimulation of this sensory receptor will produce which of the following types of responses? A. a decrease in heart rate B. an increase in the respiratory rate C. an increase in physical activity D. unconsciousness E. both a decrease in heart rate and an increase in the respiratory rate 4. Carbon dioxide is considered a(n) A. molecule B. compound. C. molecule and a compound. D. element. E. ion.

Explanation / Answer

(1)

B. It has few if any blood vessels

Cartilage is less supplied by blood hence it heals slower after injuries.

(2) B. exhibits specificity

ATP is required for receptor-mediated endocytosis

(4) c. molecule and a compound

A molecule is formed of two or more atoms. A compound is a molecule that contains at least two different elements.

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