Cardiac muscle cells have a higher concentration of mitochondria than skeletal muscle cells. What does the difference in mitochondrial concentration most likely indicate about cardiac muscle cells compared with skeletal muscle cells? A) Cardiac muscle cells have more structural proteins in their cytoplasm.
B) Cardiac muscle cells are located farther from areas where lipids are stored.
C) Cardiac muscle cells have a lower release rate of carbon dioxide into veins.
D) Cardiac muscle cells require a larger supply of energy released through respiration.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

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