chapter 13
What is a pericardial fluid?
It protects the two pericardial layers from rubbing together and creating friction.
What action of the heart do the P, QRS, and T waves represent?
P- atrial depolarization QRS- ventricular depolarization T- ventricular repolarization
What information does an EKG give the physician?
can analyze & interpret the conduction of electricity through the cardiac cells, the hearts rate, the rhythm, and general heath of the heart.
Where is the heart located in the thoracic cavity?
posterior to the sternum and superior to the diaphragm.
When does the S1 sound occur?
when both the tricuspid and bicuspid valves close.
Pericardium?
The double layer of fibrous tissue surrounding the heart.
what are the functions of the circulatory system?
1. The heart is the pump that circulates blood to all parts of the body. 2. Arteries, veins and capillaries are the structures that take blood from the heart to the cells and return blood from the cells back to the heart. 3. Blood carries oxygen and nutrients to the cells and carries the waste product away. 4. The lymph system returns excess fluid from the tissues to the general circulation and is part if the cardiovascular system.
The recommended rate of chest compressions in CPR per minute?
100
If the blood flow to the brain ceases for 5-10 seconds, the muscles will start to twitch convulsively within?
15-20 seconds.
What is the average heart rate per minute?
80-100
The SA node sends an electrical impulse to the atria that cause them to what?
depolarize/contract
Where do you place the stethoscope to hear the heart sounds?
fifth and sixth ribs, middle of the left clavicle
