Introduction:
The cardiovascular system which is also known as circulatory system is a system which allows blood to flow throughout the body and transports nutrients, gases and other important enzymes in and out of the cells. The cardiovascular system is composed of two components: the heart and the blood vessels.

Answer to Problem 1A
Correct answer:
The cardiovascular system is involved in the transport of oxygen and nutrients in the whole body. It also helps in the movement of cells of immune system and maintenance of homeostasis. Therefore, option (b) is correct.
Explanation of Solution
Reason for the correct statement:
The cardiovascular system is involved in the circulation of blood throughout the body. It plays no role in the detection of the stimuli from the external environment.
Option (b) is given as “allow for the detection of stimuli from the external environment”.
As “the cardiovascular system does not play any role in the detection of any external stimuli”, it is the right answer.
Hence option (b) is correct.
Reasons for the incorrect statements:
Option (a) is given as “transport oxygen to tissues and remove waste materials”.
It is a main feature of the cardiovascular system to transport oxygen dissolved in the blood to tissues and removing waste materials present in the blood. As the above mentioned statement is the feature of the cardiovascular system, so it is a wrong answer.
Option (c) is given as “participate in temperature homeostasis”.
Cardiovascular system transports oxygen and nutrients from the blood to the tissues for the maintenance of the homeostasis. As the above mentioned statement is the feature of the cardiovascular system, so it is a wrong answer.
Option (d) is given as “transports cell of the immune system”
Lymphatic system removes the interstitial fluid (lymph) from the tissues and thus helps in maintaining a fluid balance inside the body. The fluid which exudes out during the normal circulation gets filtered to remove bacteria, waste cells and other matter through lymph nodes. Then through lymph vessels this fluid is transported back into the blood circulation. As the above mentioned statement is the feature of the cardiovascular system, so it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
The cardiovascular system helps in the transport of oxygen, maintaining homeostasis and the transport of cells of the immune system.
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Chapter 5 Solutions
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