Document Sample
Cardiovascular-System Powered By Docstoc
					 Heart
 Blood   vessels
 Blood
 To carry needed substances to
 cells and carries waste
 products away from cells.
•The heart has
a right side and
a left side.
•Each side has
or chambers.
   Atrium- the upper chambers that receives
    blood that comes into the heart
   Ventricle- the lower chambers that pumps
    blood out of the heart
   Valve - a flap of tissue that prevents blood from
    flowing backward
   Pacemaker in the right atrium sends out
    signals that make the heart muscle contract
   Arteries carry blood away from the heart
   Veins carry blood back to the heart.
   Capillaries are tiny vessels where substances
    are exchanged between the blood and body
   Capillary walls are only one cell thick.
    Substances can pass easily through them.
   Materials like oxygen and glucose pass from
    the blood into body cells. Cellular waste
    products move from cells into the blood.
In which vessel is the pressure going to be greatest?
On the left side (change
                                Right Side
this in your notes), blood
                                             Left Side
travels from lungs to the
heart and then to the body.

•Oxygenated blood- oxygen
rich blood
On the right side (change
this in your notes), blood is
pumped through the body
and then returns again to the
•Deoxygenated blood- oxygen
poor blood
   Oxygen-poor blood is pumped into the 1. right
    atrium 2. right ventricle  3. pulmonary
    artery to the 4. lungs, where it picks up
    oxygen back to the 5. pulmonary veins back
    into 6. left atrium  7. left ventricle 8. aorta
   Blood pressure is the pressure that
    blood exerts on the walls of blood
   It is caused by the force with which the
    ventricles contract.
   As blood moves away from the heart, its
    pressure decreases.
   Blood pressure is highest in the arteries.
   A sphygmomanometer is an instrument
    that measures blood pressure.
 Blood is made up of four
 ◦ Plasma
 ◦ Red blood cells
 ◦ White blood cells
 ◦ Platelets
 The liquid part of blood.
 Plasma is mostly water.
 10 percent is made of dissolved
  materials such as food molecules,
  vitamins and minerals for the body,
  waste products, and plasma proteins.
 Carry oxygen to the body cells
 Contain hemoglobin, an iron-
  containing protein that binds
  chemically to oxygen molecules
 Produced in the bone marrow
 Have no nuclei  no need for a
 Part of the immune system to fight off
  disease causing organism
 Bigger than red blood cells
 Produced in the bone marrow
 Have nuclei
   Cell fragments
   Help form blood clots. They collect and stick
    to any site where a blood vessel is cut.
   Platelets then release chemicals that cause
    the production of the chemical fibrin.
   Fibrin weaves a net of fibers across the
    wound. The net traps blood cells and a clot is
   Cardiovascular disease is the leading cause of
    death in the United States.
   Atherosclerosis is a condition in which an artery
    wall thickens due to the buildup of fatty materials.
   Heart attacks occur when the blood flow to part of
    the heart muscle is blocked.
   Cells die in the part of the heart that does not
    receive blood. This permanently damages the
   Hypertension is a disorder in which a person’s
    blood pressure is consistently higher than normal.
    ◦ Hypertension makes the heart work harder.
    ◦ It also may damage the walls of the blood vessels over time.
Engineers work with Doctors to come up
with solutions to issues affecting the
Circulatory System
   Engineer: a person who applies his/her
    understanding of science and math to
    create things for the benefit of the world.
   Bioengineering: the use of artificial
    tissues, organs or organ components to
    replaced damaged or absent parts of the
    body with artificial limbs and pacemakers.
   Biomedical Engineer: a person who blends
    traditional engineering techniques with the
    biological sciences and medicine to
    increase quality of human health and life.
   To help maintain cardiovascular
    ◦ exercise regularly
    ◦ eat a balanced diet that is low in fat,
      cholesterol, and sodium
    ◦ avoid smoking

Shared By: