Systole and diastole: contractions of the heart (systole) alternate with periods of expansion (diastole).
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3 sentences with “contractions”
Short, simple sentences with “contractions”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Brief definition: contractions
Shortened forms of words or groups of words made by leaving out certain letters or sounds, often replaced by an apostrophe (e.g., "don't" for "do not").
3 sentences with “contractions” — examples
Muscles are the soft parts of the body that cover the bones, support the organs and produce movements by means of contractions; they are generally covered by a layer of fat.
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Beta-1 receptors are in the muscles of the heart and allow adrenaline and noradrenaline to control heart rate and the strength of contractions. If for any reason, internal or external, the mechanism gets out of control, the heart rate speeds up and the pressure rises.
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