I think its tonsils
The right lymphatic duct empties the right internal jugular and subclavian veins. The main function of the lymphatic system is to return excess tissue fluid to the blood vascular system via the lymphatic vessels.
Integumentary system covers both internal and external body structures.
Homeostatic receptors are the structures that provide information about conditions in the internal environment in living organisms. They help regulate physiological processes to maintain a stable internal environment.
the pupil
An adjustment to internal physical structures involves altering the position of body organs or tissues through manual manipulation, such as in chiropractic care. External physical structures are modified by adjusting the arrangement or configuration of components, like in engineering or architecture.
Tonsils
Tonsils
Veins have fewer internal valves than lymphatic vessels.
The integumentary system protects and covers internal structures.
The right lymphatic duct empties the right internal jugular and subclavian veins. The main function of the lymphatic system is to return excess tissue fluid to the blood vascular system via the lymphatic vessels.
To protect you'r internal organs
Integumentary system covers both internal and external body structures.
Homeostatic receptors are the structures that provide information about conditions in the internal environment in living organisms. They help regulate physiological processes to maintain a stable internal environment.
All of the structures in a lily are considered internal structure, but depending on the question, it might just want structures in the inside of the lily.
Internal components are pieces that are located inside of something.
Internal Medicine
It says that the different internal structures of a chameleon are the epidermus. Some more different structures are the vascular bundles and the cortex for moocot stems.