Anatomy Unit 7: Part 2 Flashcards
What are the general functions of circulatory systems?
To supply nutrients and remove waste from tissues.
What’s the difference between the pulmonary circuit and systemic circuit?
Pulmonary is deoxygenated blood from the heart to the lungs (Dumps CO2 and picks up O2), while Systemic is oxygenated blood from the heart to the rest of the body (Dumps O2 and picks up CO2).
How can the flow of Oxygenated Blood be described?
Oxygenated blood flows to all body tissues via the aorta and and comes back to the heart via pulmonary veins.
How can the flow of Deoxygenated Blood be described?
Deoxygenated blood pumps to the lungs via pulmonary arteries and returns to the heart via the venae cavae.
What is Blood Pressure?
The force of blood against the blood vessel walls.
What is Systole?
The beating/contraction of the heart.
What is Diastole?
The relaxation of the heart.
What are the steps to the Cardiac Cycle?
- Atria contract (atrial systole)
- Ventricles contract (ventricle systole)
- Entire heart relaxes for a brief moment (cardiac diastole)
What is the main function of the Sinoatrial Node (Pacemaker)?
To control the heart rate by using electric signals to cause the atria to contract.
What is an Electrocardiogram (ECG or EKG)?
A recording of electrical changes that occur during a cardiac cycle.
What is the P wave in an EKG?
The depolarization (contraction) of the atria.
What is the QRS Complex in an EKG?
The depolarization (contraction) of the ventricles
What is the T wave in an EKG?
The repolarization (ventricular reset); then end of the EKG
What is the main function of the arteries?
To move blood away from the heart.
What are the main properties of arteries?
They are strong and elastic to withstand the high pressure blood. They also dilate or constrict due to smooth muscle contractions
