Define a closed circulatory system and compare the...

Define a closed circulatory system and compare the differences in heart structure for animals with closed a. A closed circulatory system is a system in which the blood mixes with the interstitial fluid. Fish have a two-chambered heart. Amphibians and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation. b. A closed circulatory system is a system in which blood is separate from the interstitial fluid. Fish have a two-chambered heart. Amphibians and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation c. A closed circulatory system is a system in which blood is separate from the interstitial fluid. Amphibians have a two-chambered heart. Fishes and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation. d. A closed circulatory system is a system in which blood mixes with the interstitial fluid. Amphibians have a two-chambered heart. Fishes and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation.

Define a closed circulatory system and compare the differences in heart structure for animals with closed
a. A closed circulatory system is a system in which the blood mixes with the interstitial fluid. Fish have a two-chambered heart. Amphibians and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation.
b. A closed circulatory system is a system in which blood is separate from the interstitial fluid. Fish have a two-chambered heart. Amphibians and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation
c. A closed circulatory system is a system in which blood is separate from the interstitial fluid. Amphibians have a two-chambered heart. Fishes and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation.
d. A closed circulatory system is a system in which blood mixes with the interstitial fluid. Amphibians have a two-chambered heart. Fishes and reptiles have a three-chambered heart, but the latter has little mixing of blood. Mammals and birds have a four-chambered heart and double circulation.

Key Concepts

Closed Circulatory System

A closed circulatory system is one in which blood circulates entirely within blood vessels, remaining separate from the interstitial fluids. This system allows for more efficient and controlled distribution of nutrients and oxygen, as well as waste removal, and is characteristic of many vertebrates.

Comparative Heart Structure in Vertebrates

The structure of the heart varies among vertebrate groups, primarily in the number and arrangement of chambers. Fish typically possess a two-chambered heart, while amphibians and reptiles have a three-chambered heart, which can result in varying levels of oxygenated and deoxygenated blood mixing. In contrast, mammals and birds have a four-chambered heart that completely segregates the circulatory flows, enhancing the efficiency of oxygen delivery.

Double Circulation

Double circulation refers to the system seen in mammals and birds where the heart pumps blood through two separate circuits: one that goes to the lungs for oxygenation (pulmonary circulation) and another that delivers oxygen-rich blood to the body (systemic circulation). This separation optimizes oxygen delivery to tissues and supports a higher metabolic rate.

Transcript

00:02 Hi there.

00:04 Let's talk a little bit about circulatory systems.

00:07 Circulatory systems can be defined either as being open or closed.

00:16 Circulatory systems.

00:21 An open circulatory system does not have tubes to carry the blood.

00:27 The blood is just circulated from the heart and it is just pumped through the cavities mixing with the other fluids of the body.

00:48 It typically collects in the cavities and returns to the heart.

01:03 So the heart is really, in an open circulatory system, the heart is really just a pump that is causing fluids to circulate within the body of the organism.

01:13 But all those fluids are mixed together.

01:16 Whereas in a closed circulatory system, there are separate tubes.

01:23 Of course, we call those veins and arteries.

01:27 And blood is always contained in those.

01:45 And of course, the blood is then cycled through the body.

01:56 It goes from the heart, and it cycles through the body, and then comes back to the heart.

02:03 All right.

02:04 So that's the difference between open and closed.

02:06 When we talk about closed, open, we're typically going to find that in lower organisms, insects, things like that.

02:16 Closed circulatory systems, we tend to see in vertebrates, for example.

02:21 But within the vertebraes, there is another hierarchy that goes from a little bit less developed to a little bit more developed.

02:30 Or we can think about it in terms of evolution.

02:34 Things like fish have a closed circulatory system, but they typically, not typically, they always, they only have a two -chambered heart.

02:52 For organisms that developed lungs and started incorporating air from land, breathing air, things like amphibians and reptiles, they have a little bit more advanced system that allows them to pump blood through the lungs.

03:21 So they're going to have a three chambered heart...

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