KINESIOL 2YY3 Lecture Notes - Lecture 3: Heart Valve, Systolic Geometry, Sinoatrial Node

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17 Dec 2019

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Isovolumetric contraction systole: ventricles are contracting and are now systole. Volume of the ventricles do not change; valves are closed. This increases the pressure very rapidly to push the semilunar valve open: both valves closed, ventricular ejection systole. Semilunar valves open and goes into the systemic/pulmonary circulation. Isovolumetric relaxation diastole: close all the valves, heart relaxes and no longer full of blood. Blood tries to go into the ventricle (lower pressure) and fills in the cusps of the semilunar valve to close it. C a rd ia c c yc le event s. Atrial systole: sa node depolarizes to cause atrial depolarization p wave of the ecg. This is the end-diastolic volume (edv): qrs complex in the ecg starts the onset of ventricular depolarization. Ventricular systole: ventricular depolarization causes ventricular systole, pressure rises in the ventricles and pushes blood against the av valve to close them.

Related Questions

Match the following terms describing the physical/mecahnical events with the correct phases of the cardiac cycle. Each phase may be used more than once.

- A. B. C. D.	All 4 cardiac valves are closed and all 4 chambers are relaxed during this phase.
- A. B. C. D.	The maximum amount of blood is in the ventricles at the end of this phase.
- A. B. C. D.	The pressure in the ventricles is higher than in the atria, but lower than in the arteries, during this phase.
- A. B. C. D.	The semilunar valves are open and the AV valves are closed during this phase.
- A. B. C. D.	The atria contract at the end of this phase.
- A. B. C. D.	The pressure in the ventricles is higher than the pressure in both the atria and the arteries during this phase.
- A. B. C. D.	Systole begins with this phase.

A.	isovolumetric relaxation
B.	ventricular ejection
C.	isovolumetric contraction
D.	ventricular filling

1. What is the significance of the ST segment?

a. ventricular depolarization

b. ventricular systole

c. atrial systole

d. atrial depolarization

2. Ventricular contraction is also known as ventricular __________.

3. Ventricular diastole is also known as ventricular __________.

A nurse takes your blood pressure and tells you the numbers are 110/70. What are your blood pressures?

rev: 11_20_2014_QC_55932

a. Systolic = 110 mmHg, Diastolic = 70 mmHg

b. Diastolic = 110 mmHg, Systolic = 70 mmHg

The brachial artery is the most common site of blood pressure measurement with the sphygmomanometer.

True

False

Cardiac cycle is the ____________________________.

a. The volume of blood ejected by each ventricle in one minute

b. One complete contraction and relaxation of all chambers of the heart

c. The pressure blood exerts on the wall of blood vessels

d. Depolarization and repolarization of the ventricles

coffeesalmon954

1. The fish heart is a modified tube with _____________chambers arrayed one after the other.

2. The ____________ cycle consists of systole and diastole.

3. The spontaneous depolarization of cells in the ________________ passes through the left and right atria as a wave to finally cause the contraction of the heart.

4. ____________ is fluid formed from blood plasma minus the larger proteins.

5. A weakened section of an artery is known as a(n) ___________

6. The ________ is the amount of blood pumped by the heart each minute.

7._________ are subcellular packets of clotting enzymes.

8.________________ are basically packets of hemoglobin.

9. A normal value for blood pressure should be about

Answer: ______________________.

10. Veins contain _______________that assist in the movement of blood back to the heart.

11. The ______________delays the contraction of the ventricles to allow them to fill with blood.

12. During the cardiac cycle, contraction is called _____________and relaxation is called ___________.

13. The ________________ is the tough sac of connective tissue around the heart.

14. ___________________results when the blood's ability to carry oxygen is decreased.

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KINESIOL 2YY3 Lecture Notes - Lecture 3: Heart Valve, Systolic Geometry, Sinoatrial Node

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