Human Anatomy (8th Edition)
8th Edition
ISBN: 9780134243818
Author: Elaine N. Marieb, Patricia Brady Wilhelm, Jon B. Mallatt
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Question
Chapter 21, Problem 20RQ
Summary Introduction
To review:
The atrophication of the thymus in adults.
Introduction:
Thymus is a gland which lies posterior to the sternum. It is a part of both endocrine and the lymphatic system. The main function of the thymus is to convert immature lymphocytes into T (thymic)-lymphocytes. It also provides the site for T-cells maturation.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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.
If you dissected a fetal pig or a young cat, what difference would you expect in the thymus compared to the adult?
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.
Chapter 21 Solutions
Human Anatomy (8th Edition)
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 - Which one of the following lymphoid organs does...Ch. 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...
Knowledge Booster
Similar questions
- If the thymus gland failed to produce thymic hormones, which population of lymphocytes would be affected?arrow_forwardDescribe how the thymus’s anatomy changes as we age.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_forward
- The thymus continues to enlarge as a person ages. True Falsearrow_forwardLymphocytes that develop immunocompetence in the thymus are (a) B lymphocytes, (b) T lymphocytes.arrow_forwardBeing highly allergic to pollen and nuts, Jim has always used epinephrine injections and cortisol pills to treat his allergy attacks. Which treatment would he have to undergo if he accidentally eats a sauce cooked with peanuts, and has an acute immune reaction?arrow_forward
- Select 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_forwardIf 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_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
- What was the inaccurate name people associated with HeLa cells? How did Michael Rogers discover Henrietta's real name? Use textual evidence to support your answer.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_forwardSelect the correct answer for each question. Explain why each choice (a-d) is correct or incorrect. Which of the following statements regarding the thymus is FALSE? a. It functions strictly in T lymphocyte maturation. b. It does not directly fight antigens. c. Its stroma consists of epithelial tissue. d. It has follicles similar to those in the spleen.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning