Which of the following is the main difference between your...

Name: Problem 4, Chapter 23: Campbell Biology Concepts & Connections
Uploaded: 2020-04-14T20:16:39-08:00
Duration: 3 min 18 s
Channel: Ali Crampton
Description: Which of the following is the main difference between your cardiovascular system and that of a fish? a. Your heart has two chambers; a fish heart has four. b. Your circulation has two circuits; fish circulation has one. c. Your heart chambers are called atria and ventricles. d. Yours is a closed system; the fish's is an open system.

Which of the following is the main difference between your cardiovascular system and that of a fish? a. Your heart has two chambers; a fish heart has four. b. Your circulation has two circuits; fish circulation has one. c. Your heart chambers are called atria and ventricles. d. Yours is a closed system; the fish's is an open system.

Which of the following is the main difference between your cardiovascular system and that of a fish?
a. Your heart has two chambers; a fish heart has four.
b. Your circulation has two circuits; fish circulation has one.
c. Your heart chambers are called atria and ventricles.
d. Yours is a closed system; the fish's is an open system.

Key Concepts

Circulatory Circuits

A circulatory circuit is a complete pathway through which blood flows. In mammals, the cardiovascular system consists of two distinct circuits: the pulmonary circuit, which transports blood between the heart and the lungs for gas exchange, and the systemic circuit, which delivers oxygenated blood to the rest of the body. In fish, there is a single circuit that carries blood from the heart to the gills for oxygenation and then to the body, which reflects differences in metabolic needs and evolutionary adaptations.

Vertebrate Cardiovascular System

The vertebrate cardiovascular system involves the heart and a network of blood vessels designed to distribute nutrients and oxygen while removing wastes. Differences in the number of circuits and heart chamber structure among vertebrates highlight adaptations to various environments and metabolic demands. These variations, such as the dual-circuit system in mammals versus the single-circuit system in fish, underscore the diversity in cardiovascular design across species.

Transcript

00:01 This question asks us to identify the main difference between the cardiovascular system of that of a human and that of a fish.

00:11 Let's recall quickly that the fish cardiovascular system is actually really different than that of a human.

00:19 Humans use a double circuit while fish only use a single circuit system.

00:32 So for fish, this single circulation means that blood passes through the heart only once in each circuit.

00:42 Their movement of swimming helps propel blood through the rest of their body.

00:47 For humans, this kind of circulatory system setup would not provide enough pressure to propel the lungs to the rest of the body after it's gone through the capillary bed in the lungs.

00:59 So we require something a little bit more powerful, and the evolutionary adaptation for this is the devil circuit.

01:09 Blood is pumped a second time after it loses pressure in the lungs.

01:13 So we have the pulmonary circuit and then the systemic circuit for the rest of the body.

01:19 So let's go ahead and look at what our options are for answers.

01:25 So the first option states that humans would have two chambers.

01:29 In their heart and fish would have four.

01:33 So for a single circuit you need two chambers and for a double circuit you need four chambers.

01:41 So obviously this answer has the humans and fish reversed so this is not correct.

01:50 Just to be very clear, fish have two chambers and humans have four...

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