MCAT Heart

  1. 2 phases of heartbeating and their functions
    • Systole – ventricular contract and closing of AV valve and blod is pumped out of the ventricles, higher pressure
    • Diastole – heart relaxesand the semilunar valves are closed and blood from atria fills the ventricles

    • Cardiac output
    • Total blood pumped by a ventricle/min
    • Which is the product of heart rate (beats/min) and Stroke volume (volume of blood/min)

    • 3 different vessels of 3 diff sizes to deliver blood into the entire body
    • Arteries
    • Vein
    • Capillaries

    • Blood travels away from heart to arteries which is in the systemic circulation is the aorta. The arteries branch into ateriole which lead to capillaries
    • Venous sideof the capillary, the cap join into venules which join to form veins. The venous blood empties into the superior and inferior venae cavae for entryinto right heart
    • Venuels are smaller venous structures that connect to caps that connect to large veins of the body

    • All blood vessels are lined with endothelial cells that help to what (2)
    • maintain the vessel by releasing chemicals that aid in vasodilation and vasoconstriction
    • allow wbc to pass through the way in an inflame response

    • 3 major arteries that divide the bloodflow from aorta toward diff peripheral tissues
    • Coronary
    • Common carotid
    • Renal arteries

    • Function of arteris
    • Move blood away from the heart to the lungs and other parts of the body, mostly oxy
    • (pulmonary and umbilical art contains deoxy blood)

    Small muscular arteries are muscular and elastic and are able to withstand resistance to blood flow which ultimately the pressure helps to move the blood forward

    • Function of capillaries
    • Cell thin walls, can only move blood cells in a single file line
    • Thin walls allows for easy diffusion of gases, nutrients and waste

    • What causes a bruise
    • Capillary damage, blood leaves and enters into interstitial space

    • Function of veins
    • Thin walled, inelastic vessels that transport blood to the heart
    • vein inelasticity makes them less able to stretch to accommodate less quantities of blood

  2. Image Upload 1
  3. Image Upload 2
Card Set
MCAT Heart
mcat heart