The cartilaginous flap that closes the trachea during swallowing is called the ________.
Fill in the blank(s) with the appropriate word(s).
epiglottis
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Arrange the following events in the proper sequence:
1. Efferent neuron reaches threshold and fires an action potential. 2. Afferent neuron reaches threshold and fires an action potential. 3. Effector organ responds by performing output. 4. Integrating center reaches decision about response. 5. Sensory organ detects change in the environment. A) 5, 3, 4, 2, 1 B) 5, 2, 4, 1, 3 C) 5, 1, 4, 2, 3 D) 2, 3, 5, 1, 4 E) 3, 1, 4, 2, 5
Cells in the lungs that phagocytize inhaled debris are known as __________ __________.
Fill in the blank(s) with the appropriate word(s).
The small feathers that cover the bases of large feathers on the bodies of birds are called:
A) molts B) coverts C) wattles D) plumes
Cellular respiration results in ________ in entropy as glucose is broken down to form carbon dioxide.
an increase a decrease no change