The Circulatory System

Transport

Shuttles materials to body parts

Defense

Function related to protection

Regulation

Involves control and coordination of processes

Animals without circulatory system

Simple organisms with simpler body plans

Simple diffusion

Movement of substances from high to low concentration

Single-celled protist (paramecium, amoeboid)

Examples of organisms with simple diffusion

Hydra

Animal with a gastrovascular cavity opening to the exterior

Cnidarians

Group of animals with easy diffusion of nutrients due to a simple body plan

Flatworm

Animal with a flat body for maximum exposure to the environment

Open circulatory system

Type of circulatory system with blood pumped into an open pool

Closed circulatory system

Circulatory system with a network of blood vessels

Vertebrate circulatory system

Circulatory system closely intertwined with the respiratory system

Fishes

Vertebrates with a single circuit circulatory system

Frog (amphibian)

Vertebrate with a double circuit circulatory system

Mammals

Vertebrates with two atria and two ventricles in the heart

Human heart

Organ with valves like AV and semilunar valves

Cardiac output

Volume of blood pumped by the heart per minute

Structure of blood vessels

Includes arteries, capillaries, and veins

Blood pressure

Pressure exerted by blood on the walls of blood vessels

Blood composition

Components like platelets and clotting factors

Hemophilia

Genetic disorder leading to impaired blood clotting