BIO 112 Lecture Notes - Lecture 23: Gastrovascular Cavity, Basal Lamina, Pulmonary Artery
15 Nov 2016
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Circulatory system cont. gastrovascular cavity is used in some animals for circulation , some it will help absorb oxygen or food. Capillary parts; lumen(opening where blood flows through), endothelium(layer of tissue), basal lamina(outside) tiny so they can infiltrate tissue, and also diffuse stuff in and out. Artery and vein parts: lumen, endothelium, muscle tissue, connective tissue muscle contractions help blood keep flowing through blood vessels have elastin in them. Two-(cid:272)ha(cid:373)(cid:271)ered. o(cid:374)ly o(cid:374)e (cid:272)ir(cid:272)uit do(cid:374)"t (cid:374)eed to separate. only oxygen poor blood reaching heart. Amphibians and most reptiles have 3 chambered heart. two atria and one ventricle. two circuits, right atrium receives no-o blood bound for respiratory structures. Left atrium receives o blood bound for body tissues. sometimes mixed, makes less efficient two separate the ventricle between two sides, in amphibians there is a ridge of tissue. Limits mixing by 90%. only 10% is not separated can absolutely change how much blood flow is reaching body from the brain.
