Animal Form and Function: Blood Circulation

mes (67)in DTube • 7 days ago

In this video I go over the circulatory system of animals, which typically involves blood being pumped by the heart to and from the rest of the body. Blood allows for the transport of oxygen, carbon dioxide, nutrients, hormones, agents of immune system, heat, wastes, and more. Vertebrate animals have closed circulatory systems, while arthropods / mollusca is open to the surrounding environment. In mammals such as humans, blood is oxygenated in the lungs, then travels to the heart, which then gets pumped to the rest of the body through a network of capillaries, before returning back as the heart relaxes. Each compression and relaxation of the heart is called the heart cycle or heartbeat. The normal adult resting heart rate is between 60 to 100 beats per minute (bpm).

#science #biology #circulation #animals #education

Timestamps:

Circulatory system: Transferring blood via a pump / heart: 0:00
Circulatory systems in arthropods (open system), and fish, reptiles, mammals / birds (closed system): 3:48
Hemolymph is a fluid analogous to blood, but in arthropods (invertebrates) and molluscs (snails, etc.): 6:50
Diagram of the human circulation system and capillary networks: 8:49
Blood transports oxygen, carbon dioxide, nutrients, hormones, agents of immune system, heat, wastes: 11:36
Human heart has 4 chambers: 2 upper atria receiving blood and 2 lower ventricles discharging blood: 14:04
Diagram of heart: 16:03
Cardiac cycle or heartbeat has two periods: relaxation to fill with blood and contraction to pump blood: 19:11
Normal adult resting heart rate is 60 to 100 beats per minute (bpm): 21:30

Full video below: