Blind-ended crypts are found in the ________.
A. spleen
B. thymus
C. tonsils
D. appendix
Answer: C. tonsils
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You're resting on the couch watching TV. Which of the following is the most likely reflection of the values in your body? Regarding the partial pressures of O2 and CO2, which of the following statements is true in a normal person at rest?
A. The PCO2 in the air is approximately 40 mmHg and the alveolar PCO2 is approximately 60 mmHg. B. PCO2 in the pulmonary arteries is less than pulmonary venous PCO2. C. Atmospheric PO2 is approximately 100 mmHg and the alveolar PO2 is approximately 160 mmHg. D. The PO2 in the systemic arteries is approximately 100 mmHg and the alveolar PO2 is approximately 105 mmHg. E. PCO2 in the systemic veins is less than systemic arterial PCO2.
Answer the following statements true (T) or false (F)
1. The lungs are composed of five lobes: three in the left lung and two in the right lung. 2. Surfactant is a slippery fluid that allows the lungs to rub against the chest wall with very little friction. 3. A pneumothorax can result in a collapsed lung. 4. The respiratory system needs to exist because most of our body cells are not in contact with the air. 5. The main function of the diaphragm is to increase the air pressure in the chest cavity.
Which of the following is NOT one of the three coats that comprise the walls of arteries and veins?
A. Tunica media B. Tunica superficia C. Tunica externa D. Tunica interna
Which skull canal conveys sound waves to the eardrum?
A. jugular foramen B. external auditory canal C. carotid canal D. nasolacrimal canal E. foramen ovale