★ The Cardiovascular System OCR A-level Quiz
cardiac muscles are myogenic – what does this mean?
A. muscles contract and relax by receiving signals from the nervous system
B. they have a particular genetic mutation
C. muscles contract and relax without receiving signals from the nervous system
D. the muscle cells wall are made of myelin
Select your answer:
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Excretory System › ViewIn Reabsorption process nearly _____ percent of filtrate is reabsorbed by renal tubules to release 1.5 lit urine/ day from 180 lit filtrate formed per day
A. 93
B. 95
C. 97
D. 99
Digestive System › View
Pumps blood through the body.
A. heart
B. liver
C. stomach
D. kidney