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mammalian heart cardiac cycle
A LevelBiology~4 min read
Overview
This lesson explores the intricate structure and function of the mammalian heart, the central organ of the circulatory system. We will delve into its anatomy, the coordinated sequence of events during the cardiac cycle, and the mechanisms ensuring efficient blood transport throughout the body.
Gross Anatomy of the Mammalian Heart
The mammalian heart is a muscular, four-chambered organ enclosed within the pericardium. It is divided into two atria (upper chambers) and two ventricles (lower chambers). The **right side** of the heart receives deoxygenated blood from the body and pumps it to the lungs, while the **left side** rec...
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Key Concepts
- Cardiac Cycle: The complete sequence of events in the heart from the beginning of one beat to the beginning of the next.
- Systole: The phase of the cardiac cycle when the heart muscle contracts, pumping blood out of the chambers.
- Diastole: The phase of the cardiac cycle when the heart muscle relaxes and fills with blood.
- Myogenic: The property of cardiac muscle to initiate its own contractions without external nervous stimulation.
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Exam Tips
- →Be able to accurately label a diagram of the heart, including all four chambers, major blood vessels (vena cava, pulmonary artery/veins, aorta), and valves (tricuspid, bicuspid/mitral, pulmonary, aortic).
- →Understand and describe the sequence of events in the cardiac cycle, linking pressure changes, valve actions, and blood flow. Practice drawing and interpreting pressure-volume loops or Wiggers diagrams if introduced in class.
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