Study sets, textbooks, questions
Upgrade to remove ads
Chapter 20 The Heart
Terms in this set (47)
What are the two main functuons of the heart
1) primarily to propel blood through the blood
2) make hormones (atrial natriuretic peptide) which lowers blood pressure
How many times does a heart beat a day?
How much blood does the heart propel to the body?
1k gallons of blood/day
Whats the size of a heart?
Size of human fist
Where does the heart lie?
Lies in the mediastinum, 2/3 of it is located left of the midline
What are the two main parts of the heart?
Apex and Base
What are the layers of the heart wall?
What is pericardium?
Membrane that surrounds and protects the heart
What is the job of the pericardium?
Confines the heart to its position in the mediastinum
What is the purpose of pericardial fluid in the pericardial cavity?
Thin lubricating serous fluid between layers of the pericardium to reduce friction
What is myocardium?
Thick middle layer of cardiac muscle
What is Endocardium?
Thin inner layer of endothelium lining the chambers of the heart
What is trabecular carnae
Irregular surface of the endocardium in the ventricles
What is another name for the left border of the heart?
Briefly state the 2 main functions of the heart.
Primarily to propel blood through the body
Make hormones (ANP) which lower BP
What does the right atrium receive?
Deoxygenated blood from superior vena cava, inferior vena cava, and coronary sinus
Where does superior vena cava drain its blood from?
All upper body
Where does inferior vena cava drain its blood from?
All lower body
Where does coronary sinus drain its blood from?
Where does the left atrium receive blood from?
Oxygenated blood from the pulmonary veins
Where does the left ventricle receive blood from?
Receives the blood from the left atrium
Where is myocardium thickest in the heart?
Where is the interatrial septum located?
It is the division between the atria
Where is the interventricular septum located?
It is the division between the ventricles
List the steps of blood flow through the heart.
1) deoxygenated blood comes into the superior and inferior vena cava
2) from the superior and inferior vena cave it goes into the right atrium
3) from the right atrium it goes through the tricuspid valve to the right ventricle
4) travels up through and out the right and left pulmonary arteries to the right and left lung
5) from the right and left lungs the blood enters the right and left pulmonary veins
6) from the left and right pulmonary veins goes into the left atrium
7) leave the left atrium passes through the bicuspid valve into the left ventricle
8) leaves left ventricle goes up to the aorta
9) out of the brachiocephalic trunk, left common carotid artery, and left subclavian artery
What is a valve?
Fibrous connective tissue flaps that permit 1 way flow of blood between chamber and exiting vessels
What is chordae tendinae?
connective string-like structures
Right atrioventricular valve aka
Left atrioventricular valve aka
bicuspid valve or mitral valve
What are the 3 main circuits for blood circulation
What is the pulmonary circuit?
Pathway from the heart (R.V.) to pulmonary truck to pulmonary arteries to lungs then back to heart (L.A.)
What is the purpose of the pulmonary circuit?
to oxygenate blood and to remove CO2
What is the coronary circuit?
Pathway from the heart (L.V.) to the aorta to the coronary arteries to the heart muscle to the coronary veins to the coronary sinus and back to the heart (R.A)
also shortest circuit
What is the purpose of the coronary circuit?
to supply O2 to the heart muscle and take CO2 away from the heart muscle
What is systemic circuit?
Pathway from the heart (L.V) to the aorta to the arteries to the capillaries (tissues) throughout the body and back via veins to the heart (R.A.)
also the longest circuit in the activity
What is the purpose of the systemic circuit?
to supply O2 and nutrients to all the rest of the cells in the body and to remove CO2 and other wastes
What is the pacemaker?
S-A node sinoatrial
Where is the atrioventricular node located?
Located in the bottom of the R.A. near the interatrial septum
What is the purpose of atrioventricular node?
Picks up action potentials and directs them toward the ventricles via atrioventricular bundle
Where is the atrioventricular bundle of his located?
In the interventricular septum and splits the R&L bundle branches. This is the only way impulses can travel to the ventricles
What does the heart require?
Alot of O2
Which of the 4 chambers of the heart is located medial to the aorta & superior to the tricuspid valve?
Which chamber has the thicker at myocardium & forms the apex of the heart?
Between which 2 chambers in the left atrioventricular valve located and what else might it be called?
Or mitral valve
Explain the function of auto rhythmic fibers?
Which branch of the autonomic nervous system will decrease the electric activity of the cardiac conduction system?
Which part of the cardiac conduction system allows electrial impulses to arrive at the left and right ventricles?
Left and right bundle branches
Recommended textbook explanations
Introduction to Anatomy and Physiology
Michelle Provost-Craig, Susan J. Hall, William C. Rose
Essentials of Human Anatomy and Physiology
Elaine N. Marieb
Human Anatomy & Physiology
Elaine N. Marieb, Katja Hoehn
Anatomy and Physiology
Sets found in the same folder
Somatic &Special Senses (Sensory Function)
Anatomy Ch. 12 - Nervous Tissue: Neurons
articulations and body movements
Somatic &Special Senses (Sensory Function)
Sets with similar terms
Parts of the Heart
ANATOMY Heart and Blood Vessels
Heart Anatomy Review Questions
The Human Heart
Other sets by this creator
Corrections Multiple Choice
Intro to Corrections exam 1 study guide Ch. 1-6