Exploring the Human Cardiovascular System with its diseases and diagram.

CARDIOVASCULAR SYSTEM

The Cardiovascular System, also known as the circulatory system, is a vital organ system responsible for the transport of blood, oxygen, nutrients, hormones, and waste products throughout the body. It plays a key role in maintaining homeostasis and ensuring the proper functioning of all other organ systems.

Main Components of the CVS 

1. Heart

   • A muscular, four-chambered organ (right atrium, right ventricle, left atrium, left ventricle).

   • Acts as a pump to circulate blood.

   • Has valves to prevent backflow (tricuspid, pulmonary, mitral, aortic).

2. Blood Vessels

   • Arteries: Carry oxygen-rich blood away from the heart.

   • Veins: Return oxygen-poor blood to the heart.

   • Capillaries: Tiny vessels for exchange of gases, nutrients, and waste.

3. Blood

• Consists of plasma, red blood cells, white blood cells, and platelets.

• Red cells carry oxygen; white cells fight infection; platelets help in clotting.

Four-chambered organ

1. Right Atrium

• Receives deoxygenated blood from the body via:

  • Superior vena cava (from upper body)

  • Inferior vena cava (from lower body)

• Pumps blood into the right ventricle through the tricuspid valve.

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2. Right Ventricle

• Receives blood from the right atrium.

• Pumps deoxygenated blood to the lungs through the pulmonary artery.

• The pulmonary valve prevents backflow into the ventricle.

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3. Left Atrium

• Receives oxygenated blood from the lungs via the pulmonary veins.

• Pumps blood into the left ventricle through the mitral (bicuspid) valve.

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4. Left Ventricle

• Receives oxygen-rich blood from the left atrium.

• Pumps blood to the entire body via the aorta.

• The aortic valve prevents blood from returning into the ventricle.

📝 Note: The left ventricle has the thickest muscular wall, because it needs to generate high pressure to send blood throughout the body.

Functions of the CVS

• Oxygen and nutrient transport to tissues

• Removal of carbon dioxide and waste products

• Hormone delivery to target organs

• Temperature regulation

• Immunity (via white blood cells)

• Clot formation to prevent blood loss during injury

Common Diseases of the CVS

• Hypertension (High Blood Pressure)

• Atherosclerosis (Artery narrowing due to plaque)

• Coronary Artery Disease (CAD)

• Heart Attack (Myocardial Infarction)

• Congestive Heart Failure (CHF)

• Arrhythmias (Irregular heartbeats)

• Stroke (due to blocked or ruptured cerebral blood vessels)

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