Sistema Circulatorio Animal - Biología - Semana 7

The circulatory system in animals is essential for transporting oxygen, nutrients, and eliminating waste through a network of blood vessels and the heart. In the simplest animals, such as sponges, coelenterates, and some worms, there is no circulatory system. Types of Animal Circulatory Systems: OPEN Circulatory System - The circulatory fluid, or hemolymph, is not completely confined to blood vessels, but directly bathes the internal organs. In Mollusks: Gastropods (Snails). Bivalds (Clams, Woolly Sharks). In Arthropods: Insects, Arachnids, and Crustaceans. CLOSED Circulatory System - The heart pumps blood through arteries, which branch into capillaries. In Mollusks: Cephalopods (Octopus, Squid). Annelids (Earthworms, Leeches). Echinoderms (Starfish). In VERTEBRATES - With a fluid called blood. Concepts: SIMPLE circulatory system because blood passes through the heart only once. It occurs in a two-chambered heart (1A, 1V). Index DOUBLE circulatory system because blood passes through the heart twice. It occurs in a three-chambered heart (2A, 1V) or four-chambered heart (2A, 2V). INCOMPLETE double circulatory system because oxygenated and deoxygenated blood mix. It occurs in a three-chambered heart (2A, 1V). COMPLETE double circulatory system because oxygenated and deoxygenated blood do not mix. It occurs in a four-chambered heart (2A, 2V). Circulatory system in VERTEBRATES: In fish: Simple and complete. Bicameral Heart (1A, 1V). They breathe through gills. In amphibians and reptiles: Double and incomplete. Tricameral Heart (2A, 1V). They breathe through lung sacs and skin. They breathe through lungs. In birds and mammals: Double and complete. Tetracameral Heart (2A, 2V). They breathe through lungs. Table of Contents: 00:00 Introduction 00:33 Animals without a Circulatory System 01:09 Types of Circulatory Systems 03:21 Open Circulatory System 05:41 Closed Circulatory System 06:52 Simple, Double, Complete, and Incomplete Closed Circulatory System 09:45 Circulatory System in Fish 10:59 Circulatory System in Amphibians and Reptiles 12:44 Circulatory System in Birds and Mammals 13:50 Summary or Review