Lesson 993 of 1524
Introduction to the Cardiovascular System
The heart consists of four chambers: the two upper chambers (atria) and the two lower chambers (ventricles).
Practice this chapterThe heart consists of four chambers: the two upper chambers (atria) and the two lower chambers (ventricles). Arteries carry oxygenated blood away from the heart to the body, and veins carry deoxygenated blood back to the heart from the body.
Systole is the contraction of the heart chamber for pumping, and diastole is relaxation of the heart chamber for filling. The heart is supplied with blood by the coronary arteries.
systole — the phase of the cardiac cycle in which a chamber is contracting or pumping. diastole — the phase of the cardiac cycle in which a chamber is relaxing or filling. capillaries — small blood vessels that run between arteries and veins and allow oxygen perfusion and nutrient exchange; singular, capillary. arteries — blood vessels that carry oxygenated blood away from the heart and to the tissues for perfusion; singular, artery.
Worked example
What does “systole” mean in Introduction to the Cardiovascular System?
- 1Use the wording this chapter gives for systole.
- 2The book says: the phase of the cardiac cycle in which a chamber is contracting or pumping.
- 3Do not use the meaning of diastole. That term means the phase of the cardiac cycle in which a chamber is relaxing or filling.
Result: the phase of the cardiac cycle in which a chamber is contracting or pumping
Why. That is the meaning this chapter gives for systole.
Do not swap systole and diastole. systole means the phase of the cardiac cycle in which a chamber is contracting or pumping. diastole means the phase of the cardiac cycle in which a chamber is relaxing or filling.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.