Lecture 8 The heart Flashcards
Arterial blood flow ____from the heart while venous blood flows ______ the heart
away, towards
Aortic and pylmonary valves control flow from the ______out to the ______ vessels
ventricles, circulatory
How do we increase the force of cardiac contraction?
Every cardiomyocyte is activated during each heartbeat. There is an increase in cytosolic Ca2+ level, an increase in no.. of cross-bridges, and an increase in the force of contraction
During cardiac relaxation…
There is a decrease in cytosolic ca2+ levels. C2+ is pumped back into the SR. Cross-bridges release when ATP binds to myosin. Reduction in force means the heart can relax, and all cardiac myocytes relax each beat.
What is the name of the circuit that sends oxygen-rich blood to the tissues of the body and brings oxygen-poor blood back to the heart?
Pulmonary circuit.
Diastole is when the heart ______ and pressure is ______
Relaxes, falling
Systole is when the heart is _____and pressure is ______
Contracting, rising
The cardiac cycle is made up of:
- Atrial systole
- Atrial diastole
- Ventricular systole (isovulmetric contraction
- Ventricular ejection
- Isovolumetric relaxation
- Ventricular diastole
Systolic blood pressure measures the pressure in your: A. Body B. Veins C. Arteries D. Capillaries
C
Diastolic blood pressure emasures the pressure in your
Arteries when you heart rests between beats
What is pulse pressure?
The difference between your systolic blood pressure
What is a normal pulse pressure range?
Between 40 to 60 mmHg
Why is blood pressure in the pulmonary circulation lower than the systemic irculation?
The walls of the pulmonary capillaries are thinner than those of similar vessels in the systemic circulation
Hypotension is…
High blood pressure
Severely low blood pressure can
A. Deprive the brain and other vital organs of O2 and nutrients.
B. Cause the heart to shut down and stop pumping
C. Cause the systemic circuit to push blood in the opposite direction to try and get blood flowing around the body
A
