vas/o

tachy/

Serves as a pump to circulated blood through a system of vessels.

The heart is the size of an adult fist and weighs approx. 300 g or 10 oz

The serous membrane of the heart

This is a more delicate layer composed of simple squamous epithelial tissue over loose areolar connective tissue.

Attached to diaphragm, sternum, vertebral column, and connective tissues

Folds back to form visceral pericardium, which is the outer heart wall.

Composed of cardiac muscle tissue and a fibrous skeleton of collagen and elastic fibers. Provides force for contraction.

Inner layer of simple squamous epithelium. Also lines inside of blood vessels attached to heart.

Receive blood from veins

Pump blood to arteries

Separates the two ventricles.

Allows flow from atria to ventricles; Prevents backflow.

Where does tricuspid valve lies?

Where does bicuspid valve lies?

Extend from valve cusps to papillary muscles in ventricle walls.

Where is pulmonary semilunar valve located?

Where is aortic semilunar valve located?

Located at the base of clood vessels attached to ventricles.

The right side of the heart pumps blood to the lungs and back.

The left side of the heart pumps blood to the lungs and back.

This node is the pacemaker of the heart.

Divides into branches that continue to carry the electrival impulses from the AV node down the interventricular septum toward the heart's apex.

This is a one complete contraction and relaxation of the heart.

Systole is _____, and diastole is _____.

Choose the correct phase of cardiac cycle:

* SA node fires = atria depolarize

* Atrial contract together

* Atrial volume decreases

* Ventricular volume and pressure increases

Choose the correct phase of cardiac cycle:

* Atrial repolarize together

* Atria relax

* Atria fill

Choose the correct phase of cardiac cycle:

* Ventricles repolarize

* Ventricles relax

* Ventricle pressure decreases

* Ventricular volume increases

* Ventricles fill

Choose the correct phase of cardiac cycle:

* Impulse passes through AV node to Purkinje fibers

* Ventricles depolarize

* Ventricles contract together

* Papillary muscles contract ensuring the AV valves stay closed

Lubb

Dupp

Braking provided by the parasympathetic nervous system.

Occurs when any part of the conduction system other than the SA node is setting the pace.

Occurs if the AV node is the ectopic focus.

Shows the electrical activity of the heart during a cardiac cycle.

Show/s the depolarization of the atria.

Represent/s the ventricles depolarizing

Represent/s the ventricles repolarizing

The amount of blood ejected by each ventricle of the heart each minute.

Measured by feeling the pulse.

The normal heart rate for adult males is 64 to 72 bpm and for adult females is 72-80 bpm.

The amount of blood ejected by each ventricle of the heart each minute, but it is not the amount of blood each ventricle can hold. It is dependent on preload, contractility, and afterload.

Amount of tension in the myocardium of the ventricular walls. (Frank-Starling law of the heart)

Refers to the responsiveness of the cardiac muscle to contract.

Concerns the pressure in the pulmonary trunk and aorta during diastole. Blood pressure pushing back off the semilunar valves.

Uses sympathetic neurons to stimulate the SA and AV nodes to speed up the heart rate.

Uses parasympathetic neurons of the vagus nerve to keep the SA node at 70-80 beats/min (vagal tone).

These sensors are lcoated in the aorta and carotid arteries. They maintain homeostasis by alerting the centers to any changes in blood pressure.

The information they send alerts the cardiac centers to any change in the body's activity level.

These sensors monitor pH, carbon dioxide, and oxygen in the blood.

This has a positive chronotropic effect on hrart rate, as it complementss the sympathetic nervous system.

It has a negative chronotropic effect on heart rate because they interfere with repolarization of the myocardium.