The role of heart valves is to pump blood around and out of the heart, the valves allow blood to rush through, but quickly seal again, to prevent back flow. Making sure the heart is efficiently bring blood to the rest of the body.
8. Discuss the role of electrical impulses in coordinating the cardiac cycle.
Electrical impulses are the initial heart beat, when the muscle is pumping. This pattern of electrical impulses causing cardiac muscle contractions, is the cardiac cycle.
9. Describe how the nervous system and hormonal control alters the action of the
heart as a way of adjusting to changes in the body’s demands.
The cardiac cycle is regulated by the autonomic nervous system. The divisions of the system control heart rhythm by affecting the same impulses that contract the heart, corresponding to the bodies demand. For example, aditional hormones may be released to avoid a drop in heart rate if something were to suddenly happen to the body.
10. Explain what happens when a person suffers a heart attack.
11. Describe how a sphygmomometer, used in conjunction with a stethoscope, can be
used to determine a patient’s systolic and diastolic pressures.
- Systolic blood pressure is a measure of blood pressure while the heart is beating
- Diastolic pressure is a measure of blood pressure while the heart is relaxed, between heartbeats
12. Discuss ways in which a person can reduce the risks of developing heart disease.
A person can reduce their risks of heart disease by exercising regularly and eating a balanced plant based diet, avoiding saturated and trans fats. Reducing stress levels and having a regular sleeping patterns also contribute to heart health.
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