The contraction of the heart muscle is called

Correct Answer: C

Rationale: Systole refers to the contraction phase of the heart muscle.

Correct Answer: C

Rationale: The brachial artery in the upper arm is used with a sphygmomanometer because it's large and accessible under the cuff.

Correct Answer: C

Rationale: The myocardium is the muscular layer responsible for heart contraction.

Correct Answer: D

Rationale: The vagus nerve carries parasympathetic signals that decrease heart rate and cardiac output, promoting relaxation and energy conservation.

Correct Answer: B

Rationale: Pulmonary veins carry oxygenated blood from lungs to heart, disproving the statement.