Which of the following blood vessels play an important role in controlling blood flow to different regions of the body through the contraction and relaxation of smooth muscles in their walls?

A. arterioles
B. arteries
C. veins
D. venules
E. capillaries


A

Biology & Microbiology

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The structure of the cartilaginous and bony fishes that detects vibrations in the water is the

(a) anal fin. (b) operculum. (c) nostrils. (d) lateral line.

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Which feature is unique to echinoderms?

a. Water-vascular system b. Radial symmetry c. Cephalothorax d. Ability to regenerate body parts e. Bilateral symmetry

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As the number of genes influencing a quantitative trait increases, the range of phenotypic variation is expected to increase

Indicate whether the statement is true or false

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Which of the following is formed from a matrix of collagen fibers embedded in a hard mineral substance?

A) cartilage B) bone C) adipose tissue D) fibrous connective tissue

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