Circulatory Systems in Animals Practice Quiz (9 questions)

All questions and answers

1. Which structures can facilitate gas exchange between an animal’s internal and external environments?

Alveoli, kidneys, spiracles, and digestive organs
Spiracles, gills, alveoli, and skin
Gills, hearts, skin, and blood vessels
Hearts, blood vessels, lungs, and kidneys

Spiracles, gills, alveoli, and skin

Explanation

Gas exchange is facilitated by exchange surfaces such as spiracles, gills, alveoli, and skin. Hearts and blood vessels transport substances rather than serving as the listed exchange surfaces.

2. A biologist identifies a structure that enables gases to pass between an animal’s body and its surroundings. Which finding is an example of such a gas-exchange surface?

A fish’s intestine
A fish’s kidney
A fish’s heart
A fish’s gills

A fish’s gills

Explanation

Gills are exchange surfaces that facilitate gas exchange between an animal’s internal and external environments. The heart supports circulation, while the intestine and kidney serve other functions.

3. What distinguishes an open circulatory system from one in which blood stays enclosed in vessels?

Blood circulates through vessels and remains separate from tissues
Haemolymph courses through the body and bathes internal tissues
Haemolymph remains in vessels while blood bathes the tissues
Blood fills body cavities but does not contact internal tissues

Haemolymph courses through the body and bathes internal tissues

Explanation

In an open circulatory system, haemolymph courses through the body and bathes internal tissues rather than remaining enclosed in vessels. Vessel-enclosed blood is characteristic of a closed system; the defining distinction is not merely the fluid’s name.

4. An animal’s circulatory system uses less energy to operate than a closed system but delivers less blood to tissues with high oxygen demands. Which system does it have?

An open circulatory system
A four-chambered circulatory system
A two-chambered circulatory system
A closed circulatory system

An open circulatory system

Explanation

An open circulatory system requires less energy to operate or maintain, but moves less blood to highly oxygen-demanding tissues than a closed system. Closed circulation is associated with greater delivery to such tissues, while chamber number is a separate heart characteristic.

5. In an animal’s circulatory system, blood remains inside vessels and does not directly bathe the body tissues. Which type of system does this describe?

An open circulatory system
A respiratory system
A closed circulatory system
A lymphatic system

A closed circulatory system

Explanation

A closed circulatory system keeps blood within vessels and separate from body tissues. Tissue-bathing haemolymph describes an open system; continuous circulation and higher pressure are associated features, not the defining distinction.

6. An animal’s heart pumps blood through a continuous circulation pattern. Compared with an open system, what pressure would generally be expected in this animal’s circulation?

Generally higher pressure
Pressure equal to an open system
Generally lower pressure
Pressure determined by tissue bathing

Generally higher pressure

Explanation

A closed system’s heart pumps blood through continuous circulation, generally at higher pressure than an open system. Lower pressure is associated with open systems, while cavity filling and tissue bathing do not establish the pressure comparison.

7. A mammal’s heart is being described in a comparative biology report. Which chamber arrangement and blood-flow characteristic should the report identify?

Four chambers that separate oxygenated and deoxygenated blood
Two chambers that send blood to the gills for oxygenation
Four chambers in which the two blood types mix
Three chambers in which the two blood types mix

Four chambers that separate oxygenated and deoxygenated blood

Explanation

Most mammals have four-chambered hearts that separate oxygenated blood from deoxygenated blood. Three chambers and mixing describe amphibians, while a two-chambered heart directing blood to gills describes fish.

8. A fish’s heart pumps blood first to an oxygenation site and then onward through the body. Which route and chamber count fit this animal?

Three chambers; to the gills, then mixed in the heart
Four chambers; throughout the body, then to the gills
Two chambers; to the gills, then throughout the body
Three chambers; throughout the body, then to the gills

Two chambers; to the gills, then throughout the body

Explanation

A fish has a two-chambered heart that pumps blood to the gills for oxygenation and then throughout the body. Four chambers are typical of most mammals, and three chambers with mixing characterize amphibians.

9. A vertebrate has a three-chambered heart, and oxygenated and deoxygenated blood mix inside it before blood is pumped to the body. Which group does this describe?

Amphibians
Fish
Many invertebrates
Most mammals

Amphibians

Explanation

Amphibians have three-chambered hearts in which oxygenated and deoxygenated blood mix before blood is pumped to the body. Most mammals separate the blood types, fish have two chambers, and many invertebrates are not identified by this heart configuration.

Study with flashcards

Lock in the answers with 20 flashcards on Circulatory Systems in Animals.

What facilitates gas exchange between an animal’s internal and external environments?

Exchange surfaces such as spiracles, gills, alveoli, and skin.

What circulates through an open circulatory system and bathes its internal tissues?

Haemolymph.

How does an open circulatory system compare with a closed system in operating energy and blood delivery?

It requires less energy but moves less blood to metabolically active, high-oxygen tissues.

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