Children in the Southeastern United States play with red maple fruits (Acer rubrum). The fruits are tossed in the air and spin back to the ground, acting like small helicopters. Which part of the fruit allows for this?
A. The integument
B. The endosperm
C. The ovule
D. The pericarp
Answer: D
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Which white blood cells will harbor the HIV virus during the early infectious stages of AIDS?
a. Macrophages b. Helper B cells c. Mast cells d. Cytotoxic T cells e. Helper T cells
____ is one of the substances that maintains our blood pH between 7.35 and 7.45
a. Water b. Carbonic acid c. Hydrochloric acid d. Hydrogen peroxide e. Sodium hydroxide
Matching. Choose the one most appropriate answer
for each. 1. ___ alveoli 2. ___ bronchi 3. ___ diaphragm 4. ___ epiglottis 5. ___ rib muscles 6. ___ larynx 7. ___ medulla oblongata 8. ___ oxyhemoglobin 9. ___ pharynx 10. ___ pleural sac 11. ___ trachea 12. ___ ventilation A. flexible windpipe reinforced with cartilage B. surrounds each lung C. oxygen-rich form of a respiratory protein D. contains two true vocal cords E. alter chest cavity volume F. part of the brainstem; controls breathing G. throat passage behind the mouth H. inhalation and exhalation I. connect trachea to lungs J. flaplike structure that points upward allowing air to enter trachea, but blocks the larynx during swallowing K. contraction increases thoracic volume L. microscopically small pockets lined with moist epithelium