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Biology Project [Circulatory System] Vijay Raja Std Vii Navdeep With Sound
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Biology Project [Circulatory System] Vijay Raja Std Vii Navdeep With Sound


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My project was to prepare a presentation on human circulatory system. …

My project was to prepare a presentation on human circulatory system.
This is what it finally looked like .
Hope it comes of some use to you all .
Vijay Raja

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  • 1. The Circulatory System
  • 2. The Circulatory System
    • The function of a circulatory system is to carry blood or hemolymph into close contact with every cell in the body.
    • The most sophisticated circulatory systems consist of:
      • one or more pumps called hearts
      • arteries (tough, thick-walled tubes) that carry blood away from the heart under high pressure;
      • small vessels called capillaries whose walls are just one cell thick, allows the exchange of gases and other molecules with tissues in networks called capillary beds ; and
      • vessels called veins that return blood to the heart under low pressure
  • 3. Functions of the Circulatory System
    • Transport oxygen to cells
    • Transport nutrients from the digestive system to body cells
    • Transport hormones to body cells
    • Transport waste from body cells to excretory organs
    • Distribute body heat
  • 4. How Are Oxygen and Carbon Dioxide Transported in Blood?
    • Blood : connective tissue that consists of cells in a watery extracellular matrix called plasma
    • Remainder of the blood is made up of formed elements : platelets, red blood cells, and several types of white blood cells :
    • Platelets : Cell fragments that minimize blood loss from ruptured blood vessels by releasing material that assists in the formation of clots
    • White blood cells: which are part of the immune system fight infections
  • 5. RBCs
    • Red blood cells (RBCs):
      • transport oxygen from the lungs to tissues throughout the body
      • critical role in transporting carbon dioxide from tissues to lungs
        • In humans, red blood cells make up 99.9% of the formed elements.
      • contain an oxygen-carrying molecule called hemoglobin
  • 6. Circulation Pulmonary Circuit Systemic Circuit
  • 7. How Does the Heart Work?
    • In animals with closed circulatory systems, the heart contains at least two chambers.
    • the atrium receives blood returning from circulation
    • the ventricle generates force to propel the blood through the system.
    • Atria are separated from ventricles by atrioventricular valves.
    • The number of distinct heart chambers has increased as vertebrates diversified.
  • 8. How Does the Heart Work?
    • Vertebrates evolved two separate pumping circuits:
      • The pulmonary circulation is a lower-pressure circuit to the lungs.
      • The systemic circulation is a higher-pressure circuit to the rest of the body.
  • 9. Components of the Human Circulatory System
    • The Heart
    • Blood Vessels
    • Blood
    • Lymphatic Vessels
    • Lymph
  • 10. Types of Blood Vessels
    • Capillaries :
      • smallest vessels
      • the site where gases, nutrients, and wastes are exchanged between the blood and other tissues
    • The smallest veins are venules;
      • carry blood back to the heart after it passes through the capillaries
      • veins have much thinner walls and much larger interior diameters than arteries
  • 11. Location of Heart
  • 12. Pericardial Cavity
  • 13. Layers of Cardiac Tissue
  • 14.
    • Visceral pericardium
    • Outer protective layer composed of a serous membrane
    • Includes blood capillaries, lymph capillaries, and nerve fibers.
    • Myocardium
    • Relatively thick.
    • Consists largely of cardiac muscle tissue responsible for forcing blood out of the heart chambers.
    • Muscle fibers are arranged in planes, separated by connective tissues that are richly supplied with blood capillaries, and nerve fibers.
  • 15.
    • Endocardium
    • Consists of epithelial and connective tissue that contains many elastic and collagenous fibers.
    • Connective tissue also contains blood vessels and some specialized cardiac muscle fibers called Purkinje fibers .
    • Lines all of the heart chambers and covers heart valves.
  • 16. Heart Anatomy
  • 17. The Human Heart
    • The human circulatory system returns oxygen-depleted blood from the body to the right atrium of the heart through two large veins
      • the inferior and superior venae cavae .
    • When the right atrium contracts:
      • deoxygenated blood is sent to the right ventricle
      • it contracts and sends blood out to the lungs via the pulmonary artery
    • One-way valves ensure that blood follows only this path. After blood has circulated through the capillary beds in the lung’s alveoli:
    • it becomes oxygenated
      • returns to the heart through the pulmonary veins
  • 18. The Human Heart
    • The oxygenated blood enters the left atrium:
      • it contracts and pushes the blood into the left ventricle
    • The contraction of the left ventricle sends oxygenated blood at high pressure out the aorta and into:
      • the arteries
      • capillaries
      • veins
        • forms the systemic circulation
  • 19. Heart Anatomy
  • 20. Heart Anatomy
  • 21. VALVES
  • 22. Heart valves bicuspid valve aortic semilunar valve tricuspid valve pulmonary semilunar valve
  • 23. The Cardiac Cycle
    • The contraction phase of the atria and the ventricles:
      • called systole
    • is coordinated with their relaxation phase
      • called diastole
    • A cardiac cycle:
      • consists of one complete systole and one complete diastole
  • 24.
    • systolic blood pressure :
      • blood pressure measured in the systemic arterial circulation at the peak of ventricular ejection into the aorta
    • diastolic blood pressure:
      • blood pressure measured just prior to ventricular ejection
  • 25. Contraction cycle of the heart
  • 26. Contraction Cycle of the Heart
  • 27. Contraction Cycle of the Heart
  • 28. Excitation of the Heart
    • Depolarization of the atria
  • 29. Excitation of the Heart Depolarization of the ventricles
  • 30. Excitation of the Heart
  • 31. Excitation of the Heart
  • 32. Circulatory System -Gross and Cool Facts!
    • The body of an adult contains over 60,000 miles of blood vessels!
    • An adult's heart pumps nearly 4000 gallons of blood each day!
    • Your heart beats some 30 million times a year!
    • The average three-year-old has two pints of blood in their body; the average adult at least five times more!
    • A "heartbeat" is really the sound of the valves in the heart closing as they push blood through its chambers.