BIOL 1107 Lecture Notes - Lecture 15: Red Blood Cell, Cardiac Cycle, Capillary
8 Dec 2017
School
Department
Course
Professor
Document Summary
Transport necessary materials to all the cells of an animal"s body. Transport waste products away from the cells where they can be released into the environment. Sponges-all water enter the body from one single opening and circulate openly around the body. Vessels open up into the animal body cavity. Nutrients and waste exchanged by diffusion between hemolymph and body cells. As an animals activity increases, circulation becomes more efficient. Limitations- hemolymph cannot be selectively delivered to different tissues. Larger, more active animals need a higher pressure to pump blood to all body cells. Can be adjusted to match the animals metabolic demands. System grows in size as an animal grows. Oxygenated and deoxygenated blood separates into 2 distinct circuits. Amphibian and most reptiles have systems with features of both. Fuctions in buffering, water balance and immune cell transport. Diastole - atria contract and ventricles fill (blood pressure lowest)
