Module 15:Blood & Cardiovascular Flashcards
What type of tissue is blood
Connective tissue
What are the main components of plasma
water; it also contains proteins nutrients electrolytes hormones and gases
What is The Buffy coat
A buff colored band that white blood cells and platelets form underneath the plasma
Define Hematocrit
The percentage of cells in a blood sample
Define Serum
Plasma without the clotting proteins
Define Viscosity
How thick or sticky a fluid is
Where is red bone marrow found? What cells does it produce?
Ends of long bone & in flat irregular bones. Produces all blood cells.
What is Hemoglobin?
A red pigment that gives blood its color
What is the lifespan of Red Blood Cells
120 daya
Which organs contain phagocytic cells that engulf dead red blood cells
Liver and spleen
What is another name for red blood cells?
Erythrocytes
What is Erythropoiesis?
Production of new red blood cells through a negative feedback loop- this takes 3-5 days
What is another name for platelets
Thrombocytes
What do platelets play a key role in?
Stopping bleeding (hemostasis)
What is Hemolysis
RBCs bursting and releasing their hemoglobin into the bloodstream
What is the hearts own vascular system called
Coronary circulation
What is the role of coronary arteries and cardiac veins
Arteries Deliver oxygenated blood to the myocardium and veins collect deoxygenated blood
What is the coronary sinus
Most Cardiac veins empty here which gets returned to the right atrium
What is collateral circulation
When new blood vessels develop to enroute blood flow around a blockage
What does the P wave represent on an electrocardiogram
Atrial depolarization: the transmission of electrical impulses from the SA node through the Atria. This occurs right before the Atria contract.
What does the PR Interval represent on an electrocardiogram
The time it takes for the cardiac impulse to travel from the Atria to the ventricles
What does the QRS complex represent on an electrocardiogram
Ventricular depolarization: the spread of electrical impulses throughout the ventricles
What does the ST segment represent on an electrocardiogram
the end of ventricular depolarization and the beginning of ventricular repolarization
What does the T wave represent on an electrocardiogram ?
Ventricular repolarization
What is Cardiac Output
The amount blood the heart pumps in one minute
What is the equation for cardiac output
Heart rate x stroke volume
What is stroke volume
The amount of blood ejected by the heart with each beat
What is preload
The amount of tension or stretch in the ventricular muscle just before it contracts
What is Contractility
The force with which ventricular ejection occurs
What is Afterload
The forces the heart must work against to eject its volume of blood
What is Starlings Law?
The more the ventricles stretched within limits the more forcefully it will contract
Where does the superior vena cava receive blood from
Head shoulders and arms
Where does The inferior vena cava receive blood from
Lower body
What is the longest vein in the body
Great saphenous vein
