Echinoderms suck water into the water vascular system via a sieved opening called the __________
Fill in the blank with the correct word.
Answer: Madreporite
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The androgen-binding protein functions to
A. transport androgens in the plasma. B. confer responsiveness of certain cells to male sex hormones. C. exert negative feedback on the production of testosterone by the Leydig cells. D. transport testosterone across cell walls. E. bind and maintain high concentrations of testosterone in the seminiferous tubules.
________________________________________ respiration is the absorption of atmospheric oxygen by the blood in the lungs and the diffusion of carbon dioxide from the blood in the lungs to atmospheric air
Fill in the blank(s) with correct word
Which of the following is not a type of fibrous connective tissue?
A. Hyaline cartilage B. Reticular tissue C. Areolar tissue D. Dense regular connective tissue E. Dense irregular connective tissue
What is the effect of motor unit recruitment?
A. Involvement of multiple muscles for one movement B. A single nerve cell C. A single nerve cell and all the muscle cells it stimulates D. Hundreds of nerve endings stimulating a group of muscles