Cardiovascular system Flashcards
Basic Divisions of the Cardiovascular
- Heart
- Two closed circuits of Blood Vessels:
a) Pulmonary circuit
b) Systemic circuit
a muscular pump consisting two receiving
chambers (atria) and two pumping chambers
(ventricles)
Heart
- circulation of the blood from the heart going
to the lungs to get the oxygen and throw the
carbon dioxide and back to the heart. - Between the heart and lungs
Pulmonary circuit (Two closed circuits of Blood Vessels)
- From the heart to be distributed to the
different body system. - Between heart and different body system
Systemic circuit (Two closed circuits of Blood Vessels)
Blood Vessels (3)
- Arteries
- Capillaries
- Veins
- Carrying oxygenated blood, except pulmonary arteries that will carry unoxygenated blood.
- Reddish color
Arteries (Blood Vessels)
- Exchange of gases and giving the oxygen to the tissues and getting the carbon dioxide from the tissues.
Capillaries (Blood Vessels)
- Carrying unoxygenated blood, except
pulmonary veins that will carry oxygenated
blood. - Blueish color
Veins (Blood Vessels)
- is a four-chambered, hollow, muscular organ lying between the lungs in the middle mediastinum.
- it is about the size of a man’s fist, and in the normal male weighs approximately 250-300gm - Male/200-275gm – Female.
- the heart is shaped like an inverted cone, with its apex pointed downward and to the left base
upwards and to the right - its apex anteriorly and inferiorly to the left at 5th ICS, MCL (ICS – intercostal space, MCL – mid clavicular line)
Heart
Covering of the Heart
- Pericardium
a) Fibrous pericardium
b) Serous Pericardium
1. Parietal pericardium
2. Visceral Pericardium (Epicardium)
What is Pericardium (Covering of the Heart)
It is the covering of the heart and an invaginated sac
- Tough covering
- Provide protection and anchors the heart into the mediastinum
Fibrous pericardium (Covering of the Heart)
Under the Serous Pericardium:
- Outer layer of the serous membrane lines the fibrous coat
- That will line the fibrous pericardium
- adherent to the fibrous pericardium
Parietal Pericardium (Covering of the Heart)
Under the Serous Pericardium:
- Inner layer of the serous membrane
- Outermost layer of the wall of the heart
Visceral Pericardium / Epicardium (Covering of the Heart)
- filled with pericardial fluid that will serve as lubricant, to prevent friction between the parietal and visceral pericardium during contraction during contraction of the heart.
Pericardial Cavity
Walls of the heart
- Epicardium
- Myocardium
- Endocardium
- External/outermost layer, the visceral layer
of the serous pericardium
Epicardium (Walls of the heart)
- middle muscular layer - made up of cardiac
muscle cells
Myocardium (Walls of the heart)
- inner layer of the endothelium
Endocardium (Walls of the heart)
Chambers of the Heart
- 2 Atria
a. Right Atrium
1. Interatial septum
2. Fossa ovalis
3. Musculiati
4. Crista terminalis
5. Tricuspid valve
b. Left Atrium - 2 Ventricles
a. Right ventricle
1. Infundibulum
2. Trabeculae Carneae
3. Papillary muscles
4. Chordae tendineae
5. Moderator Band (Septomarginal band)
b. Left Ventricle
Location: Right border of the heart
Function: Receives venous blood from the
Superior vena cava (SVC), Inferior vena cava (IVC), Anterior cardiac veins, Vena cordis minimae, and the coronary sinus.
Features:
1. Interatial septum - Separates the right and left atria
2. Fossa ovalis - Remnant of the fetal foramen ovale
3. Musculiati - Ridges that allow atria expansion.
4. Crista terminalis - Separates smooth and ridges areas.
5. Tricuspid valve - Allows blood flow to the right ventricle.
Right Atrium (2 atria, Chambers of the Heart)
Location: Base of the heart
Shape: Quadrilateral
Function: Receives oxygenated blood from the lungs through the pulmonary veins.
Blood flow: Blood exits via the via the mitral/bicuspid valve to the left ventricle.
Features: Smooth interior with musculi pectinati inly in the auricle
Left Atrium (2 atria, Chambers of the Heart)
What Separates the right and left atria
Interatrial septum (Right Atrium)
What is the remnant of the fetal foramen ovale
Fossa ovalis (Right Atrium)
What is called to the Ridges that allow atria expansion.
Musculiati (Right Atrium)
What separates the smooth and ridges area
Crista terminalis (Right Atrium)
What allows the blood flow to the right ventricle
Tricuspid valve
Location: Forms most of the heart’s anterior surface.
Function: Receives venous blood from the right atrium and pumps it to the lungs via the pulmonary arteries.
Wall: Thinner than the left ventricle
Features:
1. Infundibulum - Smooth upper portion leading to the pulmonary artery.
2. Trabeculae carneae - Irregular muscular ridges aiding in blood storage
3. Papillary muscles - Conical muslces anchoring chordae tendineae
4. Chordae tendineae - Thread-like structures connecting to papillary muscles and valve cusps
5. Moderator band - prevent overdistention, unique to right ventricle.
Right ventricle (2 ventricle, Chambers of the Heart)
What the smooth upper portion leading to the pulmonary artery.
Infundibulum (right ventricle)
What is the Irregular muscular ridges aiding in blood storage
Trabeculae carneae (right ventricle)
What is the Conical muslces anchoring chordae tendineae
Papillary muscles (right ventricle)
What is the thread-like structures connecting to papillary muscles and valve cusps
Chordae tendineae (right ventricle)
What the band that prevent overdistention, unique to right ventricle.
Moderator band (right ventricle)
Location: Apex of the heart
Characteristics: Longer, narrower, and wall are 3x thicker than the right ventricle
Function: Pumps oxygenated blood to the entire body.
Apexcated at the 5th left intercostal space along the midclavicular line.
Left ventricle (2 ventricle, Chambers of the Heart)
Valves of the Heart
- Atrioventricular valves
a. Tricuspid valve
b. Mitral/Bicuspid valve - Semilunar Valves
a. Aortic valve
b. Pulmonic valve
What is between of the atrium and ventricle
Atrioventricular valves (Valves of the Heart)
– allowing blood to flow from the right atrium to the right ventricle in your heart and preventing from flowing backward.
Tricuspid valve
(Atrioventricular valves, (Valves of the Heart)
– it regulates the flow of blood from your lungs into the left ventricle, the main pumping chamber.
Mitral/Bicuspid valve
(Atrioventricular valves, (Valves of the Heart)
to allow blood to leave the heart from the left ventricle through the aorta and the body.
Aortic valve
(Semilunar Valves, (Valves of the Heart)
– guarding the pulmonary trunk and aortic valve
Pulmonic valve
(Semilunar Valves, (Valves of the Heart)
- are structures separating the chambers
Septa
separates the right and left atrium
Interatrial septum (Septa)
Septa
- Interatrial septum
- Interventricular septum
- separates the right and the left ventricles
Interventricular septum (Septa)
Blood supply of the heart
Coronary arteries
What is Coronary arteries?
- branches of the sending of aorta.
Venous drainage of the heart
Coronary sinus
What is Coronary sinus
- main venous drainage of the heart
Nerve Supply of the Heart
- Parasymphatetic
- Symphatetic
What is parasympathetic?
(Nerve Supply of the Heart)
- vagus nerve which is inhibitory to the heart
What is sympathetic?
(Nerve Supply of the Heart)
- which is excitatory(stimulate) to the heart.
- It will increase your heart rate.
Impulse Conducting system of the Heart
- Sinoatrial node (SA node)
- Atrio-ventricular node (AV node)
- Bundle of His
- Subendocardial network of Purkinje /Purkinje fibers
- Pacemaker of the heart
- located at the posterior wall in the groove
between the superior vena cava and the right
atrium
Sinoatrial node (SA node)
(Impulse Conducting system of the Heart)
Where does Atrio-ventricular node (AV node) located?
(Impulse Conducting system of the Heart)
located at the lower part of the interatrial septum
- a pale bundle about the size of a match stick
located at the interventricular septum
(upperpart) - bundle of his moves little down to the
interventricular septum, it will divide into a right and left bundle branch
Bundle of His
(Impulse Conducting system of the Heart)
- lies beneath the endocardium distributed
throughout the heart. - On the ventricular walls
Subendocardial network of Purkinje /Purkinje fibers
(Impulse Conducting system of the Heart)