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Take about 2 min and name as many song titles as you can that mention each of the following organs: Heart Brain Lungs Stomach Intestine Liver Example: “Heart shaped box” By Nirvana “Aqualung” by Jethro Tull. “Fun” Warm- Up. Cardiovascular System. While intricate and vital…….

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Presentation Transcript
fun warm up

Take about 2 min and name as many song titles as you can that mention each of the following organs:

Heart

Brain

Lungs

Stomach

Intestine

Liver

Example: “Heart shaped box” By Nirvana

“Aqualung” by JethroTull

“Fun” Warm- Up

slide7

Heart is a pump with 4 chambers.

  • 2 Atria on top
  • 2 Ventricles on bottom
  • Blood vessels are tubes.
  • Veins carry blood TO heart
  • Arteries carry blood AWAY FROM heart
the cardiac cycle

The cardiac cycle

Describing the sequence of events in one heart beat

cardiac cycle
Cardiac Cycle
  • One complete sequence of ventricular systole and diastole
  • Cycle of events that occurs as the heart contracts and relaxes
  • Both sides of heart
  • Takes approximately 0.8 secs at a heart rate of 72 beats per minute
definitions
Definitions
  • Systole = period of ventricular contraction.
  • Diastole = period of ventricular relaxation.
  • NOTE:  Normally diastole is longer than systole.
cardiac cycle1
Cardiac cycle
  • General Principles.
  • Contraction of the myocardium generates pressure changes which result in the orderly movement of blood.
  • Blood flows from an area of high pressure to an area of low pressure, unless flow is blocked by a valve.
  • Events on the right and left sides of the heart are the same, but pressures are lower on the right.
slide14

Why is pressure lower on the right side?

  • At what point in the cycle does the blood have the farthest to travel to get back to the heart?
atrial systole
Atrial systole
  • The heart is full of blood and the ventricles are relaxed
  • Both the atria contract and blood passes down to the ventricles
  • The atrio-ventricular valves open due to blood pressure
  • 70% of the blood flows passively down to the ventricles so the atria do not have to contract a great amount.
ventricular systole
Ventricular systole
  • The atria relax.
  • The ventricle walls contract, forcing the blood out
  • The pressure of the blood forces the atrio-ventricular valves to shut (producing the heart sound ‘lub’)
ventricular systole1
Ventricular systole
  • The pressure of blood opens the semi-lunar valves.
  • Blood passes into the aorta and pulmonary arteries.
diastole
Diastole
  • The ventricles relax
  • Pressure in the ventricles falls below that in the arteries
  • Blood under high pressure in the arteries causes the semi lunar valves to shut. This produces the second heart sound, ‘dub’.
  • During diastole, all the muscle in the heart relaxes.
slide19
Blood from the vena cava and pulmonary veins enter the atria.
  • The whole cycle starts again.
electrocardiograms ekg ecg
Electrocardiograms (EKG/ECG)

P = atrial excitation

QRS = excitation of ventricles

T = diastole

control of the cardiac cycle
Control of the Cardiac Cycle
  • Sinoatrial node (SAN) aka pacemaker – top of right atrium
  • Atrioventricular node (AVN) – top of the inter-ventricular septum
  • Purkyne Tissue – runs down the inter-ventricular septum
cardiac cycle2
Cardiac cycle

Match the letter on the graph to the following events

  • Semi-lunar valves open
  • Atrio-ventricular valves close,
  • Semi-lunar valves close
  • Atrio-ventricular valves open
slide34

atrio-ventricular valves close

atrio-ventricular valves open

slide35

semi-lunar valves open

atrio-ventricular valves close

atrio-ventricular valves open

slide36

semi-lunar valves open

semi-lunar valves close

atrio-ventricular valves close

atrio-ventricular valves open