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Chapter 31: Problem 40

.________ is the phase of the cardiac cycle where the heart contracts, which pushes out the blood and pumps it around the body. a. diastole b. cardiac output c. myocardial infarction d. systole

Short Answer

Expert verified
d. systole

Step by step solution

01

Understanding the Question

Identify the term that describes the phase of the cardiac cycle during which the heart contracts and pumps blood.
02

Review the Options

Examine the provided options: a. diastole, b. cardiac output, c. myocardial infarction, d. systole.
03

Define Each Term

a. Diastole is the phase when the heart relaxes and fills with blood. b. Cardiac output is the amount of blood the heart pumps in a minute. c. Myocardial infarction is a heart attack. d. Systole is the phase when the heart contracts and pushes out blood.
04

Select the Correct Option

Based on the definitions, the correct term for the heart contracting and pumping blood is d. systole.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Systole
Systole is a key phase of the cardiac cycle. During systole, the heart chambers contract. This contraction pushes blood out of the heart and into the arteries. Systole is crucial for maintaining blood flow throughout the body.
  • The left ventricle pumps blood into the aorta, sending oxygen-rich blood to the body.
  • The right ventricle pumps blood into the pulmonary artery, carrying deoxygenated blood to the lungs.
Without systole, blood wouldn't circulate properly, leading to a lack of oxygen and nutrients in tissues.
Diastole
Diastole is the phase when the heart relaxes after contraction. During diastole, the heart chambers fill with blood. This phase is just as important as systole. It ensures that adequate blood is available for the next contraction.
  • Blood flows from the atria to the ventricles.
  • Coronary arteries fill with blood, nourishing the heart muscle itself.
Balanced diastole is essential for maintaining a healthy heart rhythm and proper function.
Heart Contraction
Heart contraction refers to the act of the heart muscle tightening to pump blood. This action is facilitated by electrical impulses originating from the sinoatrial (SA) node. It ensures that blood is effectively circulated.
  • Atrial contraction moves blood into the ventricles.
  • Ventricular contraction circulates blood through the body.
Efficient heart contraction is vital for sustaining life by delivering oxygen and nutrients and removing waste products from all body cells.

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Most popular questions from this chapter

Explain how blood types are distinguished from one another. a. Blood types are distinguished on the basis of the presence or absence of different carbohydrates found on the surface of red blood cells. b. Blood types are distinguished on the basis of the presence or absence of different proteins found inside the red blood cells. c. Blood types are distinguished on the basis of the presence or absence of different lipids found on the surface of red blood cells. d. Blood types are distinguished based on the presence or absence of different antigens found on the surface of the red blood cells.

The inflammatory response involves increasing blood flow to areas of the body that contain immune system cells fighting a pathogen or foreign object. The inflammatory response is an example of a positive feedback loop. Based on this, what would cause the inflammatory response to stop in a certain area of the body? a. The white blood cells destroy all of the pathogens/foreign objects. b. The white blood cells disperse away from the site. c. More white blood cells arrive to fight the pathogens/foreign objects. d. Fewer white blood cells are needed to finish fighting the infection

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