Anatomy Final- Cardiac muscle Structure

In which structure does the heart muscle contract similary?

Smooth/skeltal muscle

Myogenic meaning

contraction without need of stimuli

Does cardiac muscle contract without nervous system?

Yes

How does a cardiac muscle look?

long cylindrical cell with 1 of 2 nuceli

Cardiac muscle contracts with BLANK same as skeltal muscle and has BLANk

Sarcomere, and Intercalated Dics 

What is a pacemaker?

they are found in the SA node AV node and purkinjie fibers and they automatically fire action potentials that start each heart beat

What is a key feature of the pacemaker?

Its responsbility is to trigger the contraction process NOT PUMPING BLOOD

What are conduction fibers?

spread electrical impulses quickly through the heart they make sure that all parts of ventricles contract in sync to pump blood effectivrly.

Where are conduction fibers located? 

Bundles of his, right and left bundle branches, and purkinjie fibers 

What is a key feautyre of conduction fibers?

they have many gap junctions which allows impulses to travel rapidly cell to cell

What are contractile cells?

these are heart muscle cells that actually contract to pump blood out of the heart and respond to electrical signals from the conduction fibers

Where are contractile cells located?

most of myocardium, walls of atria and ventricles

What is a key feature of contracticle cells? 

they have many actin anfd myosin and need alot of calcium in order to do their function, need lots of energy 

What are perkinjie fibers?

allows ventricles to get a strong contraction

P Wave

shows atrial system- atria gets signal first

QRS

ventricular syastolie and atrial diastolity also known as the on switch that makes ventricles contract

T wave

ventricular diastole 

first sound of heart beat

Av valve closing and that signals a systole when the valves open

what is the second sound of heart beat?

when SL valve closes at the begining of ventricular diastole also known as the sound of relaxations

what is ventricular filling?

mid to late diastole, blood pressure is lower when atria flows into ventricles.