Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Question
Chapter 21, Problem 20RQ
Summary Introduction
To review:
The atrophication of thymus during adulthood.
Introduction:
Lymphoid organs in the body are associated with the task of storage and proliferation of lymphocytes. They also provide the site of action for lymphocytes. The lymphoid organs are divided into two categories, namely primary lymphoid organs and secondary lymphoid organs.
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Aparna, a gross anatomist who has been teaching human anatomy for 35 years, told her class that in adults the thymus is atrophied and has no function. Is she correct? Explain.
It sometimes is difficult to distinguish the different lymphoid organs from one another in histological sections. How would you tell the thymus from a lymph node? (a) Only the thymus has a cortex and medulla; (b) lymphocytes are far less densely packed in the thymus than in the lymph node; (c) the thymus contains no blood vessels; (d) only the thymus has distinct lobules and thymic corpuscles.
In some cases of breast cancer, many of the axillary lymphnodes are removed. Why are injections not usually doneon the affected arm?
Chapter 21 Solutions
Human Anatomy
Ch. 21 - Prob. 1CYUCh. 21 - A sentinel lymph node is the first lymph node to...Ch. 21 - Fatty lymph, picked up by the lacteals in the...Ch. 21 - Prob. 4CYUCh. 21 - Prob. 5CYUCh. 21 - Prob. 6CYUCh. 21 - Prob. 7CYUCh. 21 - Prob. 8CYUCh. 21 - Prob. 9CYUCh. 21 - Prob. 10CYU
Ch. 21 - Prob. 11CYUCh. 21 - Lymphatic capillaries (a) are open-ended like...Ch. 21 - The basic structural framework of most lymphoid...Ch. 21 - Prob. 3RQCh. 21 - Prob. 4RQCh. 21 - Prob. 5RQCh. 21 - Prob. 6RQCh. 21 - Which of the following lymphoid organs have a...Ch. 21 - Prob. 8RQCh. 21 - Developmentally, the embryonic lymphatic vessels...Ch. 21 - It sometimes is difficult to distinguish the...Ch. 21 - In some people, the thoracic duct does not receive...Ch. 21 - Prob. 12RQCh. 21 - Prob. 13RQCh. 21 - Prob. 14RQCh. 21 - Prob. 15RQCh. 21 - Prob. 16RQCh. 21 - Prob. 17RQCh. 21 - As George was reading this chapter for the second...Ch. 21 - Prob. 19RQCh. 21 - Prob. 20RQCh. 21 - Prob. 1CRCAQCh. 21 - Prob. 2CRCAQCh. 21 - Prob. 3CRCAQCh. 21 - Mrs. Roselli has undergone a left radical...Ch. 21 - Prob. 5CRCAQCh. 21 - Simi realized she was very ill. During a recent...
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Similar questions
- If the thymus of an experimental animal is removed immediatelyafter its birth, the animal exhibits the following characteristics:(a) an increased susceptibility to infections, (b) decreased numbers oflymphocytes in lymphatic tissue, and (c) a greatly decreased ability toreject grafts. Explain these observations.arrow_forwardWhat is the major function of the Thymus?arrow_forwardDefine thymusarrow_forward
- Lymphocytes that develop immunocompetence in the thymus are (a) B lymphocytes, (b) T lymphocytes.arrow_forwardDue to the presence of breast cancer, Mrs. Franco had a right radical mastectomy in which her right breast, underlying muscle, and right axillary lymph nodes and vessels were removed. Now she is experiencing severe swelling in her right arm. Why did the surgeon remove lymph tissue as well as the breast? Why is Mrs. Franco’s right arm swollen?arrow_forwardSelect the best answer or answers from the choices given: The germinal centers in lymph nodes are largely sites of (a) macrophages, (b) proliferating B lymphocytes, (c) T lymphocytes, (d) all of these.arrow_forward
- Describe how the thymus’s anatomy changes as we age.arrow_forwardAs the thymus atrophies, you would expect to see an immediate decrease in the number of...? B cells T cells. neutrophils. red blood cells. « Previousarrow_forwardDiGeorge syndrome is the result of the absence or immaturity of the thymus gland at birth. This would result in a deficiency in what cell type? O 1) mast cells O 2) T cells O 3) B cells 4) natural killer cellsarrow_forward
- The capillary tubes that are used to draw blood for the measurement of hematocrit are treated with heparin. Why?arrow_forwardMs. Robinson is a 65-year-old woman who spends most of her day sitting on her porch and recovering from a recent surgery involving the removal of suspected cancerous lymph glands in the inguinal area. She is now complaining that her shoes are fitting too tightly, and she has developed poorly healing sores on her legs and ankles. A closer examination also shows distention in her varicose veins. Blood tests reveal a low level of proteins in the plasma. Based on the patient history and the signs and symptoms, identify the fluid imbalance the patient is experiencing, and state the rationale for your answer. (See Edema.) Discuss the four general causes of edema and how they apply in the case of this patient. (See Causes of Edema.) Discuss the swelling, sores, varicose vein distention, and other effects that edema can have on a patient. (See Effects of Edema.)arrow_forwardIf the thymus of an adult experimental animal is removed, the following observations can be made: (a) No immediate effect occurs, and (b) after 1 year, decreases occur in the number of lymphocytes in the blood, the ability to reject grafts, and the ability to produce antibodies. Explain these observations.arrow_forward
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