Cardiovascular Physiology Flashcards
What are the primary functions of the cardiovascular system?
Transport and distribute essential substances to tissue, removal of byproducts of cellular metabolism.
What is the purpose of arterial wall recoil during diastole?
To help move blood through the circulatory system during relaxation of the heart.
What role do skeletal muscles play in venous return?
Skeletal muscles compress veins, aiding in the return of blood to the heart.
What are the main components of blood?
- plasma
- red blood cells
- white blood cells
- platelets
What is the function of plasma in the blood?
Regulates blood pressure and temperature, contains water, electrolytes, and proteins.
What is the role of red blood cells?
Carry oxygen from the lungs to the tissues and return carbon dioxide from the tissues to the lungs.
What is anemia?
A condition characterized by a lack of red blood cells or hemoglobin, leading to reduced oxygen transport.
What is polycythemia?
A condition with an increased number of red blood cells, leading to thicker blood.
What are leukocytes?
Leukocytes: White blood cells that protect the body against infection.
What is the role of blood platelets?
Involved in blood clotting, prevent abnormal bleeding.
What is the significance of low platelet count?
Leads to increased risk of bruising and abnormal bleeding.
What happens when there is a high number of platelets?
It can lead to thrombosis or blood clots.
What factors influence blood volume?
- fitness status,
- dehydration
- body size
How does the endocrine and urinary system manage blood volume?
Through hormones like ADH and aldosterone that regulate water and salt retention.
What is the Frank-Starling mechanism?
The strength of the heart’s contraction increases with an increase in venous return (end-diastolic volume).
What is the role of the autonomic nervous system in heart rate regulation?
It regulates heart rate through sympathetic (increases HR) and parasympathetic (decreases HR) nervous systems.
What is Ohm’s Law as applied to blood flow?
Flow (F) = ΔP / R, where ΔP is the pressure gradient and R is vascular resistance.
What is the difference between laminar and turbulent flow?
- Laminar flow is smooth and orderly.
- Turbulent flow is chaotic and can be caused by changes in vessel diameter or blood flow speed.
- B = laminar flow
- C = turbulent flow
What triggers vasoconstriction in the circulatory system?
The sympathetic nervous system, exercise, or stress.
What triggers vasodilation in the circulatory system?
The release of substances like bradykinin, histamine, or nitric oxide.
What is coronary blood flow?
Blood flow that supplies the heart muscle itself, primarily during diastole.
What is the effect of increased heart rate on myocardial oxygen consumption?
Increased heart rate leads to increased oxygen consumption by the heart muscle.