Function of the Heart
The sequence of events that occurs during one heartbeat.
What is the cardiac cycle?
cardiac pacemaker
sinoatrial node (SA Node)
A complex network of connective tissues that is composed of lymphoid organs, nodes, ducts, vessels, and capillaries.
What is the lymphatic system
What 2 broad categories of mechanisms control vascular resistance?
Intrinsic and extrinsic control mechanisms
What are the two circuits of the heart?
pulmonary and systemic
How is the cardiac cycle coordinated?
Contraction and relaxation of the chambers of the heart.
located in the right atrium near the entrance of the SVC
SA node
A liquid that moves through the body carrying blood cells, nutrients, hormones, and dissolved gasses.
What is plasma
In what tissues are intrinsic control mechanisms generally dominant over extrinsic control mechanisms?
coronary, circulatory, brain, working skeletal muscle. Critical tissues
What two layers make up the inner serous
parietal and visceral
The contraction of the heart is called?
Systole
Where is the AV node located?
junction of atria and ventricles
Defensive cells that are part of the immune response and created in bone marrow and lymphoid organs.
What are lymphocytes?
What is the most important intrinsic control mechanism?
Metabolic control of blood flow
What is the visceral layer of the serous pericardium?
epicardium
The relaxation of the myocardium
What is Diastole
located in the interventricular septum, it receives electrical activity to move from atria to the ventricles.
AV bundle
This function of the lymphatic system is returning fluid from tissues to the bloodstream
What is fluid recovery?
What metabolic chemical signal causes vasoconstriction?
Oxygen
Three places you can get blood from
superior vena cava, inferior vena cava, coronary sinus
Why are the autonomic nerves needed?
The ANS can change the pumping activity of the heart.
A record of electrical activity in the heart. It records the sum of all the electrical events occurring in all the cells of the heart at any point in time.
What an ECG shows
Lymph vessels have these to prevent backward flow.
Valves
How does the heart provide cardiac output?
Generating pressure on the enclosed blood.
When blood first enters the system, is it oxygenated or deoxygenated?
Deoxygenated