Interview part 11 Flashcards
(12 cards)
What is systole?
Contraction of arteries/ventricles
What is diastole?
Relaxation of arteries/ventricles
Describe the structure of arteries
Thick outer layer of longitudinal collagen and elastic fibers prevents leaks from bilges. Thick walls withstand high pressure. Thick layers of circular elastic fibers and muscle fibers to pump blood. Narrow lumen to maintain high pressure.
What is the function of arteries?
Withstand high pressure. Brings oxygenated blood from the heart to the body.
Describe the structure of veins
Thin layer with few circular elastic fibers and muscle fibers as blood does not flow in pulses. Thin walls so that nearby muscles can help push blood towards the heart. Thin outer layer of longitudinal collagen and elastic fibers as pressure is low. Wide lumen to accommodate the slow flowing blood.
What is the function of veins?
Brings the blood to the heart (from the legs) and thin walls for “fast” oxygen absorption.
What is the function of the pulmonary circulation system?
brings deoxygenated blood (carbon dioxide) to the heart
What is the function of the systemic circulation system?
brings oxygenated blood from the lungs to the body.
What is the hepatic portal system responsible for?
The hepatic portal system is responsible for directing blood from parts of the gastrointestinal tract to the liver. Substances absorbed in the small intestine travel first to the liver for processing before continuing to the heart. Many drugs that are absorbed through the GI tract are substantially metabolized by the liver before reaching general circulation.
What is the role of the liver regarding the regulation of the level of nutrients in the blood?
- Sugar and salt levels
- Amino acids (have to be detoxified when in excess)
- Many minerals and vitamins
Define blood pressure
the force the heart exerts against the walls of arteries as it pumps the blood out to the body
Define heart rate
the number of times your heart beats per minute.
