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Heart facts Heart pumps over 2,500 gallons per day ¼ cup per beat

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Presentation on theme: "Heart facts Heart pumps over 2,500 gallons per day ¼ cup per beat"— Presentation transcript:

1 Heart facts Heart pumps over 2,500 gallons per day ¼ cup per beat
70-75 beats per minute Over 60,000 miles of blood vessels

2 1. What type of view is this?
Name this gland. 3. Name 2 hormones secreted by this gland. 4. Name this gland 5. What are the effects of the hormone secreted by this gland?

3 Heart outline pulmonary & systemic circulation
location of heart in thorax pericardium fibrous skeleton external anatomy of heart internal anatomy of heart coronary circulation CAD, angina and heart attacks heart valves conduction system of heart EKG’s cardiac muscle

4 Pulmonary circuit Systemic circuit
artery vein artery vein Systemic circuit CO2 O2


6 T9

7 Looking at the left side
from the right Looking at the right side from the left


9 Pericardial cavity

10 Visceral pericardium Myocardium Endocardium
Fibrous pericardium Parietal pericardium Visceral pericardium Myocardium Endocardium Epicardium = visceral pericardium + adipose

11 Pericarditis = inflammation of the pericardium

12 Fibrous skeleton: collagen & elastic fibers between chambers & around valves
structural support prevents valves from being overly distended anchors myocardium electrical “insulator” between atria and ventricles

13 aorta Superior vena cava Pulmonary artery Pulmonary veins Right atrium Auricle of left atrium Right ventricle Left ventricle Inferior vena cava Anterior View

14 aorta Pulmonary artery Superior vena cava Pulmonary veins Left atrium Right atrium Inferior vena cava Left ventricle Right ventricle Posterior view


16 Chambers of the Heart 4 chambers 2 upper atria (atria = entry hall)
(auricle = little ear) 2 lower ventricles (ventricles = little bellies) Auricle

17 Right atrium SVC Coronary Sinus (opening) Pectinate muscle
Fossa ovalis IVC Right AV orifice

18 Right ventricle Pulmonary valve Trabeculae carneae Tricuspid valve
Papillary muscle with tendinous cords

19 Left ventricle Aortic valve Mitral (bicuspid) valve Papillary muscles
with chordae tendineae Trabeculae carneae

20 Right atrium & ventricle
Left atrium & ventricle

21 Coronary circulation

22 Coronary circulation RCA Coronary sinus LCA (Under auricle) RCA
L & R coronary artery = directly off aorta just distal to aortic valves Coronary sinus = drains into right atrium

23 Mitral & tricuspid valve
Aortic & pulmonary valve Coronary sinus R & L coronary arteries

24 Fig. 20.12 Coronary artery disease (CAD)
narrowing of coronary arteries leading cause of death in US Atherosclerosis fatty plaque on arterial walls

25 By-pass Graft

26 Myocardial infarction (MI)
dead tissue areas in myocardium caused by interruption of blood flow cardiac muscles cells don’t regenerate replaced by scar tissue Angina pectoris (chest pain) scarred or ischemic cardiac muscle can’t pump or conduct electrical impulses arrhythmias (ventricular fibrillation)

27 Referred pain: Organ & skin pain fibers travel to the spinal cord together Organ pain misinterpreted as skin pain (referred pain)

28 Aortic valve (semilunar valve) Pulmonary valve (semilunar valve) Bicuspid or Mitral valve Tricuspid valve

29 Atrioventricular (AV) valves
Semilunar valves aortic & pulmonary valves each has 3 cusps (no tendinous cords) close when pressure in ventricles falls Atrioventricular (AV) valves tricuspid and bicuspid (Mitral) tricuspid = 3 cusps, bicuspid = 2 connected to papillary muscle via tendinous cords close when pressure in ventricles increases

30 Papillary muscle Chordae tendineae (tendinous cords)

31 Cardiac Cycle = 1 heartbeat
Diastole = relaxation Systole = contraction

32 Atrioventricular Valves Open
Ventricular diastole Atrial systole (atrial pressure > ventricle pressure)

33 Atrioventricular Valves Close
Ventricle systole Atrial diastole Ventricle pressure > atrial pressure A-V valves close preventing backflow of blood into atria Murmurs – any abnormal heart sound mitral valve prolapse, stenosis, insufficiency Rheumatic fever

34 Pulmonary valve Aortic valve

35 What are the ventricles doing in A?
Valve Function Review A B What are the ventricles doing in A? What are the ventricles doing in B?

36 Cardiac Cycle = 1 heartbeat
How does the heart beat? Cardiac Cycle = 1 heartbeat

37 Conduction System of Heart
SA node – AV node – AV bundle of His (between ventricles) – Purkinje fibers How does your heart rate change? Nervous control (ANS) hormones drugs Heart block: electrical signals blocked Arrhythmia: irregular heart beat Fibrillations: uncoordinated contractions

38 EKG = electrocardiogram
Recording electrical currents in heart P wave atrial contraction P to Q interval time for impulse to travel from SA node to AV node QRS complex ventricular contraction T wave ventricular relaxation

39 Heart failure Impairment of the heart to fill or pump
a sufficient amount of blood through the body right side peripheral edema ascites jugular venous distention left side dyspnea (shortness of breath) orthopnea pulmonary edema

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