Cardiac muscle cells are both _____
A) striated and interconnected by intercalated disks
B) smooth and under voluntary control
C) striated and under voluntary control
D) smooth and under involuntary control
A
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Bone loss outpaces bone formation when a person suffers from ____
a. osteoporosis b. Parkinson's disease c. muscular dystrophy d. Alzheimer's disease e. bone spurs
In lineages that moved onto land, gills were replaced by lungs; kidneys became better at conserving __________, and
the circulatory system became more efficient. Fill in the blank(s) with the appropriate word(s).
What would be the ultimate effect on an ecosystem if decomposers were eliminated?
a. The consumers would have to eat twice as much. b. The rate of photosynthesis would increase. c. All life would eventually cease as nutrients would no longer be available. d. Energy flow between producers and consumers would increase. e. Producers would outgrow consumers due to the excess of carbon dioxide.
What is a key feature of an open circulatory system?
a. No vessels carry the blood. b. Open-ended vessels carry the blood. c. Closed vessels carry the blood. d. No heart pumps the blood. e. Hemoglobin is carried in the blood.