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THE HEART  <3 BLOOD AND THE HEART FUN FACTS THE HEART  <3 BLOOD AND THE HEART FUN FACTS

THE HEART <3 BLOOD AND THE HEART FUN FACTS - PowerPoint Presentation

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Uploaded On 2020-06-17

THE HEART <3 BLOOD AND THE HEART FUN FACTS - PPT Presentation

An average adult human contains about 5 liters 53qt of blood The blood makes up about onethirteenth of the bodys weight The adult heart weighs about 280 grams 10 oz At rest the heart pumps out about 80 millimeters ID: 780399

heart blood valve pulmonary blood heart pulmonary valve body node impulse left ventricles lungs valves atria contract atrium ventricle

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Slide1

THE HEART <3

Slide2

Slide3

Slide4
BLOOD AND THE HEART FUN FACTS

♦ An average adult human containsabout 5 liters (5.3qt) of blood.♦ The blood makes up about onethirteenth

of the body’s weight.

♦ The adult heart weighs about 280 grams (10 oz.)

♦ At rest, the heart pumps out about 80 millimeters

(2.6 oz) of blood with each beat.♦ The heart beats, on average, 70 times each

minute at rest.♦ This means all the blood is circulated (goesround the body once) in about one minute.♦ During strenuous exercise the heart can pump

six to eight times the amount of blood that it

pumps at rest.

Slide5
Superior vena cava and

inferior vena cava – bringdeoxygenated blood toright atrium

Pulmonary artery – takes

blood away from right

ventricle to the lungs for

O2 Pulmonary veins – bring oxygenated blood

from lungs to left atriumAorta – takes blood away from left ventricle torest of the body

Slide6
Chambers and Valves

• SEPTUM divides into R and L halves• Upper chambers – RIGHT ATRIUM and LEFT ATRIUM• Lower chambers – RIGHT VENTRICLE and LEFT VENTRICLE

• Four heart valves permit flow of blood in one direction

Slide7
-TRICUSPID VALVE – between right atrium and

right ventricle

-BICUSPID

(MITRAL) VALVE – between left atrium

and left

ventricle-Semilunar valves are located where blood leaves

the heart - PULMONARY SEMILUNAR VALVEand AORTIC SEMILUNAR VALVE

Slide8
8

The right side receives oxygen-poor blood from the body and tissues and then pumps it to the lungs to pick up oxygen and dispel carbon dioxide

Its left side receives oxygenated blood returning from the lungs and pumps this blood throughout the body to supply oxygen and nutrients to the body tissues

The heart=a muscular double pump with 2 functions

Slide9
9

Two

circulations

Systemic

circuit: blood vessels that transport blood to and from all the body

tissues

Pulmonary circuit: blood vessels that carry blood to and from the lungs

Slide10
10

Chambers of the heartsides are labeled in reference to the patient facing you

Two atria

Right atrium

Left atrium

Two ventricles

Right ventricleLeft ventricle

--------------------------------------------------------------------------------

Slide11
11

Valves

three:

tricuspid

one:

bicuspid

“Tricuspid” valve

RA to RV

Pulmonary

valve

RV to pulmonary trunk (branches R and L)

Bicuspid

valve (the bicuspid one)

LA to LV

Aortic valve

LV to aorta

(cusp means flap)

Slide12
12

Function of AV valves

Slide13
13

Function of semilunar valves

(Aortic and pulmonic valves

)

Slide14
Meet the Heart

http://www.youtube.com/watch?v=Vi1JK6IYVt8

Slide15
15

Pattern of flow

(simple to more detailed)

Body

RA

RV

LungsLALVBoby

Body to right heart to lungs to

left heart to body

Body, then via vena

cavas

and coronary sinus to RA, to RV, then to lungs via pulmonary arteries, then to LA via pulmonary veins, to LV, then to body via aorta

From body via SVC, IVC & coronary sinus to RA; then to RV through tricuspid valve; to lungs through pulmonic valve and via pulmonary arteries; to LA via pulmonary veins; to LV through mitral valve; to body via aortic valve then aorta

LEARN THIS

Slide16
PHYSIOLOGY OF THE HEARTThe heart is a double pump. When the heart

beats…Right HeartDeoxygenated blood flows into heart from vena

Cava ---right atrium ---tricuspid valve--- right

ventricle --pulmonary semilunar valve---

pulmonary artery ---lungs (for oxygen)

Left HeartOxygenated blood flows from lungs via pulmonary

Veins--- left atrium--- mitral valve--- left ventricle---aortic semilunar valve--- aorta --- generalcirculation (to deliver oxygen)

Slide17
Control of Heart Contractions

SA (sinoatrial) NODE = PACEMAKER• Located in right atrium

• SA node sends out electrical impulse

• Impulse spreads over atria, making them

contract

• Travels to AV NodeAV (atrioventricular

) NODE• Conducting cell group between atria andventricle• Carries impulse to bundle of HisBUNDLE OF HIS

• Conducting fibers in septum

• Divides into R and L branches to network of

branches in ventricles (Purkinje fibers)

PURKINJE FIBERS

• Impulse shoots along Purkinje fibers causing

ventricles to contract

Slide18
Flow Through the Heart

http://www.youtube.com/watch?v=7XaftdE_h60

Slide19

SA Node

Sinalarterial node

 “Pacemaker”

AV Node

Atrioventricular node

Allows impulse to cross

into ventricles

Bundle of His

Bundle Branches

Purkinje Fibers

Heart Contraction

Slide20
Heart Contraction Flow Chart

SA

Node fires

Impulse spreads across atria

Atria depolarizes↓Atria contract (lub)

Blood is pumped to the ventricles

AV Node receives impulse from SA Node

Impulse passes through bundle of His

Impulse passes through Purkinje fibers

Ventricles depolarize and contract (dub)

Blood is pumped into the lungs and out to the body

Slide21
21

Electrical conduction system:

(Explanation in next slides)

specialized cardiac muscle cells that carry impulses throughout the heart musculature, signaling the chambers to contract in the proper sequence

Slide22
22

Conduction system

SA node (sinoatrial)

In wall of RA

Sets basic rate: 70-80

Is the normal pacemaker

Impulse from SA to atria

Impulse also to AV node via

internodal

pathway

AV node

In

interatrial

septum

Slide23
23

Conduction continued

SA node through AV bundle (bundle of His)

Into interventricular septum

Divides

R and L bundle branches

become

subendocardial

branches (“Purkinje

fibers”)

Contraction begins

at apex

Slide24
24

Slide25
EKG→ measures heart electricity

P

Wave→ Atria

contract & Depolarize

PQ Interval→ Impulse is passing through the bundle of His to the Purkinje fibers

QRS Wave→ Ventricles depolarize and contract

T Wave→ Ventricles repolarize 

Slide26
Cardiac Cycle

Blood enters the atria through the vena cava (R) and the Pulmonary vein (L)

Atria will contract

Blood is pushed through the AV valves into the ventricles

↓Ventricles contract and AV valves close↓

Blood is pushed though the pulmonary and aortic semilunar valves into the pulmonary trunk and the aorta

Ventricles relax and valves

close

 

Slide27
Cardiac Cycle Tutorial

http://faculty.alverno.edu/bowneps/cardiaccycle/cardiaccycle1map.htm