During exercise, your heart rate can increase dramatically in order to meet the metabolic demands of your tissues. If your heart rate increased to 144 beats per minute, approximately how long would diastole last in a single cardiac cycle?
A) 0.2 second
B) 0.6 second
C) 0.8 second
D) 1.6 seconds
Answer: A
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Which reaction represents cellular respiration?
A. Sugar + Oxygen ? Carbon dioxide+ Water + ATP B. Water + ATP ? Carbon dioxide + Sugar C. Carbon dioxide + Water + ATP ? Sugar + Oxygen D. Oxygen + Carbon dioxide ? Sugar + Water + ATP
What are some of the different respiratory systems seen in animals?
What will be an ideal response?
According to the above figure, which letter corresponds to the area where amino acids are most likely to be reabsorbed?
A. A
B. B
C. C
D. D
E. E
Muscle contraction results from the repeated cycle of interactions between myosin and actin. What is the last step of this cycle, after which the cycle starts over again?
A) New ATP molecules bind to the myosin heads, causing them to disengage from the actin. B) The myosin heads split the ATP into ADP and Piand store the energy. C) The myosin head bends (the power stroke). D) Myosin heads extend toward the Z lines at the ends of the sarcomere.