Wednesday, April 8th, 2015

Lesson Objectives

  1. Illustrate structures of the cardiovascular system, including the anatomical structure of the heart.
  2. Explain the functions of the cardiovascular system.
  3. Identify factors that affect blood flow.
  4. Science Practice: Analyze how new technologies and experiments affect previous scientific explanations.

The heart is an important of the cardiovascular system.

VOCABULARY:

artery, atrium, blood vessel, capillary, circulatory system, heart, platelet, pulmonary artery, pulmonary vein, red blood cell, urea, ventricle, vein, white blood cell

Structure and Function of the Cardiovascular System

  • Cardio means “heart” in Greek.
  • It is also known as the circulatory system.
  • It is the internal transportation system.
  • It maintains homeostasis, the state of maintaining a stable environment despite changing external conditions.

Heart

  • It is a muscle in the mid left area of the chest, protected by the ribcage
  • It is the hardest working muscle.
  • The heart contracts to help blood circulate within the body.
  • It pumps up to 2,000 gallons of blood per day.

Blood Vessels

  • Arteries– the blood vessels that carry blood away from the heart
    • Thick and muscular and elastic
  • Veins-the blood vessels that carry blood back to the heart.
    • Valves– the structures within the body that ensure the flow of a fluid is in one direction only.
  • Capillaries– very thin blood vessels that connect arteries and veins.

Blood

composed of:

  • Plasma- colorless liquid
  • Red Blood Cells- carry oxygen to organs
  • White blood cells-help fight infection
  • Platelets- seal off a blood vessel when it is cut or torn
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