The sleep-wake cycle is controlled by interactions among how many neural systems?
a. 1
b. 2
c. 3
d. 4
e. 5
C
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How many chromosomes will you find in a successfully fertilized egg?
A. 21 pairs B. 46 pairs C. 23 pairs D. 16 pairs
The first event in muscle fiber contraction is that
A) the muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules. B) acetylcholine diffuses across a gap at a neuromuscular junction. C) calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. D) acetylcholine is released from the end of the motor neuron.
Predict what type of tissue would be abundant in vessels that act as resistance vessels
A) Smooth muscle B) Elastic tissue C) Loose connective tissue D) Simple squamous epithelium
Which of the following bones is not a facial bone?
A. Zygomatic B. Frontal C. Lacrimal D. Nasal