Which structure allows upper respiratory infections to spread from the throat to the tympanic cavity?
A. Oval window
B. Cochlear duct
C. Auditory canal
D. Auditory (Eustachian) tube
E. Tympanic cavity
D. Auditory (Eustachian) tube
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A synapse is a junction between two nodes of Ranvier.
Answer the following statement true (T) or false (F)
Blood leaves the heart through ____________________ and returns by ____________________.?
Fill in the blank(s) with correct word
Which of these is demonstrated by the oxygen-hemoglobin dissociation curve?
A. The greater the PO2 of the blood, the greater the dissociation of O2 from hemoglobin. B. At normal resting systemic arterial PO2 , hemoglobin is almost 100% saturated with oxygen. C. At normal resting systemic venous PO2 , only about 75% of the hemoglobin is in the form of deoxyhemoglobin. D. More additional oxygen binds to hemoglobin when going from a PO2 of 60 to 100 mmHg, than is added when going from a PO2 of 40 to 60 mmHg. E. As PO2 increases, the saturation of hemoglobin with oxygen increases linearly.
In a free body diagram of the human body, which direction would the vector representing weight of the body point?
A. up B. down C. depends on body orientation D. not possible to determine