Yes. It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
The human upper respiratory tract serves as a reservoir for a diverse community of commensals and potential pathogens, such as Haemophilus influenzae, Moraxella catarrhalis,etc. which can occasionally develop into pathogens and cause infectious diseases. Viruses are responsible for the majority of upper respiratory tract infections.
Nasal hairs are used to catch debris. Particles are propelled upward and out of the respiratory tract by cilia on the epithelium of the trachea and bronchi. The respiratory system has a feature that guards against infections.
Therefore, It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
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Answer: The correct answer for the fill in the blank is A) Circulatory, immune.
Circulatory system also called cardiovascular system is a vast network of organs and vessels that allow the circulation of blood so as to transport nutrients, oxygen, other gases, and hormones to different parts of the body.
Blood contains different cells like white blood cells, red blood cells, platelets.
White blood cells ( also called leukocytes) work closely with immune system. They provide defense against pathogen ( disease causing organisms) through various ways ( like ingesting foreign material, producing antibodies to clear the antigens). By doing so, they protect us from infection and disease.
Answer:
A. Provided the major energy source used by mitochondria
