Air is carried between the pharynx and bronchial tubes in the:
A) epiglottis.
B) trachea.
C) nasal cavity.
D) esophagus.
B) trachea.
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Lymph nodes release a substance called tumor ________ factor, which causes cancer cells to become necrotic and die
Fill in the blank(s) with correct word
Which component(s) of the lymphatic system is/are located in the mediastinum?
A) adenoids B) thymus C) tonsils D) spleen
Exercise refers to virtually all physical training and sports activities.
Answer the following statement true (T) or false (F)
Which of the following is TRUE concerning the body's stress response?
A. Sex hormones are increased so that the human race can thrive. B. Breathing rate slows so that muscles are ready to do battle. C. Stress hormones cause oxygen to be released to the muscles for super strength. D. Stored sugar and fats remain in the liver in case of injury. E. Blood clotting stops to prevent infection.