These are found in the upper respiratory system and in the lining of the trachea. The epithelium contains goblet cells that produce mucins. Mucins are the component of a mucus that protects the airways. They protect the airways by trapping unwanted material in mucus coated cilia that are swallowed or expelled.
Answer:
A. depend on a concentration gradient
Explanation:
Simple and facilitated diffusion are the two methods of transport of substances down their concentration gradient. In both processes, substances are moved from the region of their higher concentration to that of their lower concentration. Since simple diffusion and facilitated diffusion are passive processes, there is no requirement of energy input to drive them. Both are driven by the concentration gradient of the substances only.
Antibodies are released into the bloodstream and attached themselves to foreign antigens such as toxins, bacteria and foreign cells. The attachment of an antibody to an antigen marks the pair for destruction.
This helps maintain homeostasis by providing the body protection against disease and infection.
The answer is true!
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Explanation:
Respiration using oxygen.
