Circulation can be split into two systems: ________ circulation, from the heart to the lungs and back to the heart, and ________ circulation, from the heart to the body tissues and back to the heart.
A. pulmonary; systemic
B. systemic; pulmonary
C. arterial; venous
D. venous; arterial
Answer: A
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Indicate whether the statement is true or false.
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A. Most of them contain phosphorus. ?B. They are nonpolar molecules. ?C. Most of them contain sulfur. ?D. They are polar molecules.
People who are at high risk for heatstroke include
A) people who have mice for pets. B) mountain climbers and elderly marathoners. C) athletes who exercise in high heat, soldiers in the desert. D) people prone to fevers and infants.
In the nervous system, chemical messages cross a __________, a short distance between the signal and target cells
Fill in the blank with the correct word.