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Heart
heart
94
Anatomy
Undergraduate 3
03/07/2011

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Cards

Term
Mediastinum
Definition
anatomical region extending from the sternum to the vertebral colum, the first rib to the diaphragm, and in between the lungs
Term
why does the heart sit a little to the left?
Definition
because the ?RIGHT? ventricle is bigger
Term
what is the posterior surface of the heart?
Definition
the back side of the heart
Term
pericardium
Definition
membrane surrounding and protecting the heart
Term
3 parts of the pericardium
Definition

1. fibrous pericardium

2. serous pericardum

3. pericardial fluid

Term
fibrous pericardium
Definition

-makes sure your heart doesnt move around

- prevents overstretching and protection

-tough

Term

serous pericardium

Definition

-on the visseral(on the heart) of heart

-double layer

- thin

Term
pericardial fluid
Definition

-reduces friction

Term
epicardium
Definition
  • external layer
  • smooth, slippery
Term
myocardium
Definition
  • muscle
  • 95% of heart is cardiac muscle
Term
endocardium
Definition
  • inner layer
  • smooth lining for chamber of heart
Term
atria
Definition
recieving chamber from body and lungs
Term
auricles
Definition
make sure heart doesnt get too full of blood
Term
ventricles
Definition
muscular pumping chambers
Term
sulci
Definition
grooves on the surface of the heart
Term
blood flow order
Definition

right atrium

tricuspid

right ventricle

pulmonary valve

pulmonary trunk

pulmonary artery

lungs

pulmonary veins

left atrium

bicuspid (mitral) valve

left ventricle

aortic valve

aorta

body

superior/inferior vena cava

Term
pectinate muscles
Definition
helps with rythym and makes sure no over flow
Term
internal septum
Definition
separates the right and the left atrium
Term
tricuspid valve
Definition
separates right atrium form right ventricle
Term
what is the thickest chamber of the heart?
Definition
the left ventricle
Term
left ventricle
Definition
  • pumps blood to body
  • works harder to maintain same rate of blood flow as right ventricle
Term
where does the right ventricle pump blood to?
Definition
lungs
Term
where does the left ventricle pump blood to?
Definition
body
Term
what is a dense connective tissue that forms a structural foundation, point of insertion for muscle bundles, and electrical insulator between atria and ventricles?
Definition
fibrous skeleton
Term
door ways until the preasure opens them?
Definition
semilunar valves
Term
systemic circuit
Definition
left side of heart
Term
pulmonary circut
Definition
right side of heart
Term
the ends of fibers are conected by...
Definition
intercalated discs
Term
desmosomes
Definition
hold fibers together
Term
gap junctions
Definition
allow action potential conduction from one fiber to the next
Term
autorythmic fibers
Definition

specialized cardiac muscles

  • self excitable
Term
depolarization
Definition
  • contractile fibers have stable resting membrane potential
  • voltage gated fast Na channels open
  • Na flows in
  • then deactivate and Na inflow decreases
Term
plateau
Definition
  • period of maintained depolarization
  • slow ca channels
  • ca moves from interstitial fluid int sytosol
  • triggers contraction
Term
repolarization
Definition
recovery of resting membrane potential
Term
refractory period
Definition

time interval during which second contraction cannot be triggered

  • last long
Term
EKG
Definition
  • composite record of action potentials produced by all the heart muscle fibers
Term
how do you read an EKG?
Definition
compare tracings from different leads with one another and normal records
Term
the 3 waves in an EKG
Definition
P, QRS, T
Term
cardiac action potential arises in?
Definition
SA node, and P waves appear
Term
during atrial sytole .... are relaxed
Definition
ventricles
Term
during ventricle systole... are relaxed
Definition
atria are relaxed
Term
cardiac output (CO)
Definition
volume of blood ejected from left (or right) ventricle into aorta (or pulmonary trunck) each minute
Term
cardiac reserve
Definition
difference between maximum CO and CO at rest
Term
preload
Definition

degree of stretch on the heart before it contracts

(pulling back a sling shot)

Term
venous return
Definition
volume of blood returning to right ventricle
Term
more Ca inreases?
Definition
contractions
Term
contractility
Definition
strength of contraction at any given preload
Term
positive inotropic agents
Definition
increase contractility
Term
negative inotropic agents
Definition
decrease contractility
Term
acidosis
Definition
cant breathe off their CO2
Term
too much Na can block?
Definition
Ca from coming in
Term
after load
Definition
pressure that must be overcome before a semilunar valve can open
Term
what tells the SA node to slow down?
Definition
Vagus nerve
Term
increase HR and contractility
Definition
thyroid, epinephrine and norepinephrine
Term
capillaries
Definition
site of exchange in blood vessel, allows diffusion
Term
endothelium
Definition
lining in blood vessel and heart
Term
tunica interna
Definition
inner linnig in direct contact with blood
Term
tunica media
Definition
muscular and connective tissure layer of blood vessel
Term
tunica externa
Definition
  • elastic and collagen fibers
  • helps keep blood supply
  • helps keep in place
Term
anastomoses
Definition
union of the branches of 2 or more ateries supplying the same body region
Term
arterioles
Definition
abundant microscopic vessels
Term
smallest blood vessels
Definition
capillaries
Term
connects arterial flow and venous return
Definition
Term
capillary exchange
Definition
movement of substances between blood and interstitial fluid
Term
                  transcytosis  
Definition
brings in what it needs and gets rid of what they dont need
Term
bulk flow
Definition
passive process in which large numbers of ions, molecules, or particles in a fluid move together in the same direction
Term
important for solute exchange
Definition
diffusion
Term
important for regulation of relative volumes of blood and intestitial fluid
Definition
bulk flow
Term
from capillaries into interstitial fluid
Definition
filtration
Term
from interstitial fluid into capillaries
Definition
reabsorption
Term
net filtration pressure
Definition
pressure that promote reabsorption
Term
starlings law
Definition
nearly as much reabsorbed as filtered
Term
blood flow
Definition
volume of blood that flows throught any tissure in a given period of time
Term
contraction of ventricles generates?
Definition
Blood Pressure
Term
systolic BP
Definition
highest pressure attained in arteries during systole
Term
diastolic BP
Definition
lowest aterial pressure during diastole
Term

opposition to blood flow due to friction between blood and walls of blood vessels

DEPENDS ON:

size of lumen

blood viscosity

total blood vessel length

Definition
vascular resistance
Term
venous return
Definition
volume of blood flowing back to heart through systemic veins
Term

occurs due to pressure generated by construction on left ventricle

 

Definition
venous return
Term
monitor pressure changes and stretch in blood vessel walls
Definition
baroreceptors
Term
monitor movements of joints and muscles to provide input during physical activity
Definition
proprioceptors
Term
chemoreceptors
Definition
monitor concentration of various chemicals in the blood
Term
released by adrenal medulla in response to sympathetic stimulation
Definition
epinephrine and norepinephrine
Term
increases cardiac output by increasing rate and force of heart contractions
Definition
epiephrine and norepinephrine
Term
  • produced by hypothalamus
  • released by posterior pituitary
  • responds to decreased blood volume
  • causes vasoconstriction, which increases BP
Definition
antidiuretic hormone (ADH) or vasopressin
Term

atrial natriuetic peptide (ANP)

 

Definition
  • released by cells of atria
  • lowers BP, by causing vasodialation and promoting loss of salt and water in urine
  • reduces blood volume
Term
how is the strength of heart beat determined?
Definition
determined by substances tht alter the movement of Ca through slow Ca channels
Term
blood pressure
Definition

the amount of preassure exerted upon vessel walls by the blood

 

 

Term
autoregulation
Definition
the ability of a tissure to vasoconstrict or casodialate blood vessels to meet metabolic demands of that tissue
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