Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Lymph from the lower limbs drains into the right lymphatic duct.
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20. The Lymphatic System
Lymphatic Vasculature
1:47 minutesProblem 5
Textbook Question
Lymph nodes are densely clustered in all of the following body areas except:
a. Brain
b. The axillae
c. The groin
d. The cervical region
Verified step by step guidance1
Step 1: Understand the function of lymph nodes. Lymph nodes are small, bean-shaped structures that are part of the lymphatic system. They filter lymph fluid and house immune cells to help fight infections.
Step 2: Identify the common locations of lymph nodes in the body. Lymph nodes are typically found in areas where the body is more vulnerable to infection, such as the axillae (armpits), groin, and cervical region (neck).
Step 3: Recall that the brain does not contain lymph nodes. The central nervous system, including the brain, is protected by the blood-brain barrier and does not have lymph nodes clustered within it.
Step 4: Compare the options provided in the question. The axillae, groin, and cervical region are all areas where lymph nodes are densely clustered, while the brain is not.
Step 5: Conclude that the correct answer is the brain, as it is the only area listed that does not have densely clustered lymph nodes.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Lymphatic System
The lymphatic system is a network of vessels and nodes that plays a crucial role in the immune system by transporting lymph, a fluid containing infection-fighting white blood cells. It helps maintain fluid balance in the body and filters harmful substances through lymph nodes, which are strategically located throughout the body.
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Lymph Node Distribution
Lymph nodes are distributed throughout the body, with higher concentrations in areas such as the axillae (armpits), groin, and cervical region (neck). These clusters are essential for filtering lymph and mounting immune responses, while certain areas, like the brain, have fewer lymph nodes due to the blood-brain barrier and different immune mechanisms.
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Immune Response
The immune response is the body's defense mechanism against pathogens. When lymph nodes detect foreign substances, they activate immune cells, such as lymphocytes, to respond. This process is vital for protecting the body from infections, and the location of lymph nodes influences how effectively the immune system can respond to threats in different body regions.
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