BIO 208 Lecture Notes - Lecture 18: Cardiac Muscle Cell, Coronary Circulation, Coronary Sinus
Document Summary
Heart i: arteries takes blood away from the heart, veins takes blood to the heart. What is a circulatory system: a series of specialized structures that facilitate the internal transport of gases, nutrients, and wastes, thus minimizing the diffusion distances and increasing diffusion ef ciency. Human heart: is really 2 hearts in one. Complete separation, no mixing of entering venous blood with departing arterial blood. Pulmonary circuit vs. systemic circuit: is myogenic. Local control with ans overrides and local overrides over ans. Blood supply to the heart muscle: coronary circulation meets heavy demands of myocardium for oxygen and nutrients, coronary arteries (right, left) branch from aorta base, anastomoses (arterial interconnections) ensure constant blood supply, drainage is to right atrium. Valves: regulate blood ow into and out of chambers, times and coordinated, complex structures made up of brous aps attached to the cord tendineae anchored in the papillary muscles, responsible for the heart sounds".
