Answer:
Cartilage rings of trachea have protective role
Explanation:
Trachea is a tube, part of the respiratory system, which allows the passage of the air: from larynx to lungs (primary bronchi). It is enveloped with cartilage rings that prevent collapse of the trachea when there is no air. The cartilage "rings" are C-shaped, except one full ring-shaped - the cricoid cartilage which attaches trachea to the larynx.
Answer:
A chemical regulator secreted from an endocrine gland that travels through the bloodstream to affect target cells
Explanation:
Hormones are the chemicals that serve as signaling molecules and regulate activities of their respective target cells. Hormones are secreted by ductless endocrine glands. Being ductless glands, they release hormones directly into the bloodstream. Therefore, hormones travel through the bloodstream to reach their target cells. Binding of receptors present on or in the target cells is followed by signal transduction and generation of a cellular response.
For example, the insulin hormone is released into the bloodstream by the pancreas. The hormone stimulates the uptake of glucose by liver and muscle cells (the target cells).
Eukaryotic cells have Membrane-bound organelles which Prokaryotic cells do not posses.
So, option D is your answer.
Hope this helps!
Extracellular fluid<span>-the fluid outside the body's cells
-either in the bodies tissues or as plasma (liquid portion of blood)</span>
