Which event happens at the start of a cardiac cycle?
A) Atrial systole occurs.
B) The P wave develops.
C) Blood is ejected from the atrium.
D) The SA node fires.
E) Ventricular systole occurs.
D) The SA node fires.
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If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________.
A) threshold is reached more quickly and heart rate would increase B) potassium channels compensate and no change in heart rate would occur C) heart rate would decrease, but blood pressure would rise due to the excess sodium present D) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
A joint capsule is reinforced by
A) ligaments binding articular ends of bones together. B) tendons binding articular ends of bones together. C) hyaline cartilage providing strength to the capsule walls. D) articular cartilage cushioning ends of bones.
Which type of muscle works together with the agonist?
A) synergist B) prime mover C) antagonist D) fixator
The amount of cortical space in the primary motor cortex devoted to a given body part is proportional to the size of the part
Indicate whether the statement is true or false