1 / 21

Unit K – Heart Structure and Function

Heart Quiz. Unit K – Heart Structure and Function. Unit K – Heart Structure and Function. First baby step – anatomy of heart heart review. Diagram (quiz…). Diagram (quiz…). Parts of the Heart Left and Right Atria – Collecting Chambers

hao
Télécharger la présentation

Unit K – Heart Structure and Function

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Heart Quiz Unit K – Heart Structure and Function

  2. Unit K – Heart Structure and Function First baby step – anatomy of heart heart review

  3. Diagram (quiz…) Diagram (quiz…)

  4. Parts of the Heart Left and Right Atria – Collecting Chambers -- Right: Collects blood from VenaeCavae -- Left: Collects blood from Pulmonary Veins Left and Right Ventricles – Pumps -- Right: Sends blood to the lungs via the Pulmonary Trunk. -- Left: Sends blood to the body via the Aorta

  5. Atrioventricular-- Valves -- Valves between the atria and ventricles -- Prevent backflow of blood -- Right hand side “Tricuspids”— three cusps, or flaps (also known as right atrioventricular valve -- Left hand side “bicuspid”– two cusps (also known as the mitral valve or left atrioventricular valve) ChordaeTendineae –Strong, Fibrous strings that support the A.V. valves --Keeps the valves from inverting with the force of blood flow.

  6. Semi-Lunar Valves (no chordae tendineae) -- Between the ventricles and the Aorta (aortic valve) -- Between the ventricles and the Pulmonary Trunk (pulmonary valve)

  7. Pulmonary Trunk -- Branches off to form the Pulmonary Artery -- Receives blood from the right ventricles Septum -- The wall of the Heart -- Separates the left and right sides of the Heart

  8. heart beat!

  9. Control of Heart • Heart is muscle tissue • Beat of heart is INTRINSIC will beat independently of any nervous stimulation

  10. Coordination of Heartbeat • 2 nodes – SA node and AV node both located in the right atrium • 1) SA node – sinoatrial node/ pacemaker – upper wall of right atrium. • Acts as a pacemaker • Activates muscle cells of both atria to contract almost simultaneously

  11. Coordination of Heartbeat

  12. Coordination of Heartbeat • 2) AV node – atrioventricular node – base of r.a. • impulse from SA node travels via nerves called the bundle of HIS • AV node initiates contraction of both ventricles via Purkinje fibers

  13. Coordination of Heartbeat • SA node connected to brain via the Vagus nerve – brain signals SA node through this nerve and sets heart rate • Medulla oblongata part of brain that monitors blood pressure • Regulation is autonomic (not under conscious control)

  14. Electrocardiogramekg- a way to measure electrical activity of heart • Measures the electrical activity of heart in millivolts (mV) • This forms a graph that is then labeled PQRST • P curve – atria contracting • QRS – contraction of the ventricles • T recovery • Heart beat approx. 50 -80 beats/min.

  15. ECG/EKG

  16. The red line is the EKG. The blue line is aortic pressure. The green line shows heart sounds.

  17. Blood Pressure • Is the force of blood against the blood vessels • Not constant & is greater when ventricles contract • 2 parts – systolic pressure (systole) – pressure when ventricles contract – higher number – given first

  18. Diastolic pressure – diastole – pressure when ventricles are not contracting – atrial contraction Blood pressure is measured along a brachial artery 120/80 = normal Hypertension – high blood pressure (diet, stress, exercise) Blood Pressure

  19. Blood Pressure – cont’d • Hypotension – low blood pressure • Hypothalamus –part of brain that monitors blood pressure and can cause the arteries to constrict or dilate • heart attack!

More Related