Cardiac muscle contractions Flashcards
Isotonic contraction is the muscle fighting against
The same heaviness
Isometric contraction is the muscle fighting against
Something heavier
Inotropism is the modification of
Muscular contractility
Bowditch effect is an
Autoregulation method
In the Bowditch effect, myocardial tension increases, how does it affect the heart rate
It increases it
The post-extra-systole potentiation occurs when
There is a weaker than normal heart beat so the next one is stronger to compensate
How will a greater telediastolic volume affect the contraction
It will result in a stronger contraction
What is the telediastolic volume
The volume of blood at the end of relaxation
Why is it important to have a specific point between contraction and stretching (between myosin and actin)
If too contracted: myosin and actin too close together
If too stretched: too far apart
In both cases, no interaction will occur
In Frank-Starling mechanism, the greater the distorsion,
The greater the contraction and amount of pumping to systemic circulation
Which ventricle needs more pressure to pump blood?
Left ventricle because aortic pressure is greater than pulmonary artery pressure
A small increase in right atrium pressure will lead to what changes in right ventricle output
High changes
Which ventricular output increases more rapidly with an increase in their corresponding atrial pressure
The right ventricle output increases more rapidly its output for an increase in atrial pressure
An equal increase in right and left atrial pressure will increase more the right ventricular output than left
As myocytes stretch they have a greater or lesser systolic contraction
Greater
Which muscle contraction contracts for longer (skeletal or cardiac)
Cardiac muscles
