Essentials of Human Anatomy & Physiology Plus MasteringA&P with eText -- Access Card Package (11th Edition)
Essentials of Human Anatomy & Physiology Plus MasteringA&P with eText -- Access Card Package (11th Edition)
11th Edition
ISBN: 9780321918758
Author: Elaine N. Marieb
Publisher: PEARSON
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Chapter 12, Problem 1MC
Summary Introduction

Introduction:

The lymphatic system is the drainage system of the body that picks up the lymph (excess interstitial fluid) and returns it to the blood. The lymph capillaries absorb the excess and leaked fluid and weave between the blood capillaries as well as the tissue cells.

Expert Solution & Answer
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Answer to Problem 1MC

Correct answer:

The lymph capillaries contain endothelial cells, which are separated via flap like valves that can open wide.

Explanation of Solution

Explanation for the correct answer:

Option (c) is given that lymph capillaries possess endothelial cells separated by flap like valves that can open wide. The lymph capillaries contain the flap like mini valves, which act as the one-way swinging door. The endothelial cells that form the walls overlap one another loosely thus, forming the valve. Hence, option (c) is correct.

Explanation for incorrect answers:

Option (a) is given that lymph capillaries are open-ended same as the drinking straws. The lymph capillaries are not open at one end; instead, they are separated by the flap-like minivalves, which act as one way swinging door. So, it is an incorrect option.

Option (b) is given that lymph capillaries have continuous tight junctions like the capillaries present in the brain. The lymph capillaries possess flap like minivalves and not the tight junctions. So, it is an incorrect option.

Option (d) is given that lymph capillaries contain special barriers that stop cancer cells from entering. The bacteria and the cancer cells can enter the lymph capillaries as they do not contain special barriers to prevent their passage. So, it is an incorrect option.

Hence, options (a), (b), and (d) are incorrect.

Conclusion

The lymph capillaries contain endothelial cells that form their wall. The endothelial cells overlap at the edges and form flap like mini valves that functions as one-way door.

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Students have asked these similar questions
Which of the following is/are false about the lymphatic system? A. It is a vascular system that takes up excess interstitial fluid and transports it to the bloodstream. B. It drains into the circulatory system via two large ducts that drain into veins near the shoulders. C. Among its components is the network of tiny lymphatic vessels that intermingle among capillaries of the cardiovascular system. D. A pump delivers lymph through the lymphatics. E. C and D only
Which of the following is not true of the lymphatic system? Oxygen is transported to body tissues a. b. Slow muscular contractions cause the fluid to move in the vessels The lymph is returned to the veins C. d. There are flap-like valves to prevent the backflow of fluid O O O O
Which of the following is not a function of the lymphatic system? A. Transports immune cells and bacteria around the body B. Assists in the transport of fats C. Facilitates gas exchange between capillaries and the lungs D. Drains excess fluid from body tissues
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