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Chapter 12: Problem 4

When the heart is relaxed, it is said to be in diastole. a. True b. False

Short Answer

Expert verified
a. True

Step by step solution

01

Understand Diastole

Diastole is the phase of the cardiac cycle when the heart muscles relax and the chambers fill with blood.
02

Determine the Correct Answer

Since diastole is defined as the relaxation phase of the heart, the statement is true.

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Key Concepts

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

The Cardiac Cycle
The cardiac cycle refers to the series of events that occurs when the heart beats. These events ensure that blood is pumped throughout the body efficiently. The cardiac cycle consists of two main phases: systole and diastole.
During systole, the heart contracts to pump blood out of the chambers. In contrast, during diastole, the heart muscles relax, and the chambers fill with blood.
It is important to have a clear understanding of these phases.
  • Systole: Contraction of the heart muscles and pumping of blood.
  • Diastole: Relaxation of the heart muscles and filling of the chambers.
Together, systole and diastole coordinate to keep blood flowing efficiently to all parts of the body.
Heart Relaxation
Heart relaxation occurs during the diastole phase of the cardiac cycle. When the heart is in diastole, the heart muscles are not contracting. Instead, they are relaxed, allowing the chambers to fill with blood.
This period of relaxation is crucial for a few reasons:
  • It allows ample time for the ventricles and atria to fill with blood, ensuring an adequate blood supply for the next beat.
  • It reduces the workload on the heart, preventing fatigue and damage.
In simpler terms, diastole is like the 'resting' phase for the heart, giving it a brief break before it contracts again during systole.
Chamber Filling
Chamber filling is a key part of the diastole phase. When the heart relaxes, the pressure inside the chambers drops, allowing blood to flow into them.
There are two main types of chambers involved:
  • Atria: The upper chambers that receive blood from the veins.
  • Ventricles: The lower chambers that pump blood out to the arteries.
During diastole, blood flows from the atria into the ventricles. This filling process can be divided into two parts:
  • Passive filling: Blood flows passively from the atria to the ventricles due to the pressure difference.
  • Atrial contraction: Toward the end of diastole, the atria contract to push any remaining blood into the ventricles.
Proper chamber filling is essential for efficient blood circulation. If the chambers do not fill adequately, the heart will not be able to pump enough blood to meet the body's needs.

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Most popular questions from this chapter

Hemoglobin is specialized to _______ oxygen where \(\mathrm{pH}\) is low, oxygen concentration is low, or temperatures are high. a. release b. pick up

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The plasma protein that is activated and forms a network of fibers across a wound to trap RBCs is _____. a. prothrombin b. thrombin c. fibrinogen d. fibrin

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