Question

question 23
the internal environment of the human body is protected by the ____, which is(are) referred to as the first line of defense.
skin
connective tissue
white blood cells
muscle tissue
question 24
hassall corpuscles are part of the:
thymus.
spleen.
tonsils.
thoracic duct.
question 25
lacteals:
drain into the right lymphatic duct.
are the lymphatics in the villi of the small intestines.
are able to absorb fat from the digestive system.
both b and c are correct.

Explanation:

• Question 23: The skin acts as a physical barrier, preventing pathogens and foreign substances from entering the body, which is why it is the first - line defense. Connective tissue provides structural support, white blood cells are part of the immune response (second - line defense in some cases), and muscle tissue is for movement.
• Question 24: Hassall corpuscles are unique structures found in the thymus. The spleen is involved in filtering blood and immune responses (but has no Hassall corpuscles), tonsils are part of the lymphatic system in the throat, and the thoracic duct is a major lymphatic vessel.
• Question 25: Lacteals are lymphatic capillaries in the villi of the small intestine. They are responsible for absorbing dietary fats (chylomicrons). They do not drain into the right lymphatic duct (most lacteals drain into the thoracic duct). So, lacteals are the lymphatics in the villi of the small intestines and are able to absorb fat from the digestive system.

Answer:

• Question 23: skin
• Question 24: thymus
• Question 25: Both B and C are correct.