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Chapter 31: Problem 23

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.

Short Answer

Expert verified
Option b: Blood is separate; Fish: two-chambered; Amphibians/Reptiles: three-chambered; Mammals/Birds: four-chambered.

Step by step solution

01

Understand the Closed Circulatory System Definition

A closed circulatory system is one in which blood does not mix with the interstitial fluid. This system maintains the separation between the blood and the other fluids in the body.
02

Analyze Fish Heart Structure

Fish have a two-chambered heart. This consists of one atrium and one ventricle, suitable for their aquatic environment.
03

Analyze Amphibians and Reptiles Heart Structure

Amphibians and reptiles usually have a three-chambered heart, consisting of two atria and one ventricle. However, reptiles have a mechanism to minimize the mixing of oxygenated and deoxygenated blood.
04

Analyze Mammals and Birds Heart Structure

Mammals and birds have a four-chambered heart, with two atria and two ventricles. This arrangement supports double circulation, where there is a clear separation between oxygenated and deoxygenated blood.
05

Match the Correct Option

Based on the definitions and heart structures examined, determine the correct description for a closed circulatory system along with the heart structures for different groups of animals.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

heart structure in fish
Fish possess a relatively simple heart compared to other vertebrates. Their heart is two-chambered and consists of one atrium and one ventricle. The atrium receives deoxygenated blood from the body, and the ventricle pumps it directly to the gills for oxygenation. After oxygenation, blood circulates through the rest of the body before returning to the heart. The simplicity of this system is suitable for the aquatic environment in which fish live, as their metabolic needs are generally lower than those of terrestrial animals.
heart structure in amphibians and reptiles
Amphibians and reptiles exhibit a more complex heart structure than fish. Most amphibians and reptiles have a three-chambered heart, consisting of two atria and one ventricle. The two atria receive oxygenated and deoxygenated blood separately. In the single ventricle, there is some mixing of the two blood types, although certain reptilian species have developed mechanisms to reduce this mixing. For instance, reptiles like turtles and lizards can partially separate the oxygenated and deoxygenated blood within their ventricle. This design allows these animals to maintain a higher metabolic rate and adapt to both aquatic and terrestrial environments.
heart structure in mammals and birds
Mammals and birds have the most advanced heart structure among vertebrates. Their four-chambered heart consists of two atria and two ventricles. This design efficiently separates oxygenated blood from deoxygenated blood, supporting double circulation. In double circulation, one loop circulates blood to the lungs for oxygenation (pulmonary circulation), while the other loop delivers oxygen-rich blood to the rest of the body (systemic circulation). This complete separation ensures a higher oxygen supply to body tissues and supports the high metabolic rates necessary for sustaining active lifestyles and maintaining a constant body temperature. This complex and efficient heart structure is essential for endothermic animals, enabling better regulation of body temperature and increased activity levels.

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Most popular questions from this chapter

Explain how blood types are distinguished from one another. a. Blood types are distinguished on the basis of the presence or absence of different carbohydrates found on the surface of red blood cells. b. Blood types are distinguished on the basis of the presence or absence of different proteins found inside the red blood cells. c. Blood types are distinguished on the basis of the presence or absence of different lipids found on the surface of red blood cells. d. Blood types are distinguished based on the presence or absence of different antigens found on the surface of the red blood cells.

Insects have open circulatory systems in which blood, or hemolymph, circulates through the body cavity rather than through closed blood vessels. Birds, like other vertebrates, have closed circulatory systems in which blood remains within arteries, veins, and capillaries as it circulates. How has this difference most likely influenced the evolution of birds and insects? a. The open circulatory system of birds warms their entire body quicker, allowing them to live in colder climates more successfully than insects. b. The closed circulatory system allows blood flow to increase to the flight muscles during flight, allowing insects to be better fliers than birds. c. The greater efficiency of a closed circulatory system allowed birds to become larger than insects. d. The simplicity of the open circulatory system allows insects to have a higher metabolism than birds.

What is the heart鈥檚 internal pacemaker? a. An internal implant sends an electrical impulse through the heart. b. It is an electrical impulse that starts in cardiac muscle cells at the sinoatrial node. c. It is the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node. d. It starts in the aorta.

Differences in human blood types show how genetic differences have evolved over time, affecting red blood cell structure. What is the basis for blood type classifications? a. It is based on antigens made of carbohydrates, specifically glycoside and N-acetylglucosamine, found on the surface of red blood cells. b. It is based on antigens made of proteins, specifically glycolipids and glycoproteins, found on the surface of red blood cells. c. It is based on antigens made of proteins, specifically peripheral and integral proteins, found on the surface of the red blood cell. d. It is based on antigens made of lipids, specifically glycerophospholipids, found on the surface of red blood cells.

If a person has blood type AB/Rh-, what antibodies will be found in the blood? a. A antibodies b. A antibodies and B antibodies c. Rh antibodies d. B antibodies
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