Histology Exam 2 Flashcards
Component of the Circulatory System Include:
Heart, Arteries, Capillaries, Veins, and the Lymphatic Vascular System
On a slide, Arteries will appear ________ while Veins will appear ________
Round with Thicker Walls, Compressed with Thin Walls
The Apex of the Heart is Found…
At the Left Ventricle
Direction of Blood Flow
Right: Right Artia -> Right Ventricle -> Lungs
Left: Left Artia -> Left Ventricle -> Aorta -> Body
Three Major Layers of Heart Chambers
Endocardium, Myocardium, and Epicardium (Visceral Pericardium)
True or False: The heart has an internal rhythmical electrical activity that keeps it continually beating.
True
Why does a heart completely severed from the body still continue to beat for a period of time?
There are certain cardiac muscle cells that repeatedly fire action potentials that trigger the heart to contract.
What is the name of the self-excitable cells that start heart contractions?
Autorhythmic Cells
What do autorhythmic cells do?
Repeatedly generate action potentials that cause the entire heart to contract
In the start of the conduction system, where does the signal initiate?
In the Sinoatrial (SA) Node from a group of Autorhythmic Cells (Located on the wall of the Right Atrium)
Where do the action potentials from the Sinoatrial (SA) Node travel to?
Both Atria, Making them Contract
From the SA Node, where does the Action Potential lead?
To the Atrioventricular (AV) Node (Located in the Wall Dividing the Atria)
From the AV Node, the action potential enters the ___________
Atrioventricular (AV) Bundle/Bundle of His (Group of Autorhythmic Cell)
When does the only electrical connection between the atria and ventricles take place?
When the action potential leaves the AV Node and enter the Bundles of His (Where it actually takes place)
After the AV Bundle, the action potential travels down the septum to the bottom of the heart to ____
Large Purkinjie Fibers that conduct the action potential to most ventricle fibers
