Blood vessels and nerves attach to a lymph node at the
A) hilus.
B) apex.
C) medulla.
D) base.
E) cortex.
A) hilus.
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________ reflexes perform the simplest functions of the autonomic nervous system
A) Somatic B) Cranial C) Spinal D) Visceral E) Consensual
Lacking a mouth and digestive system, in many ways the anatomy of this invertebrate resembles that of a gut turned inside out
A) Sponge B) Hydra C) Cestode D) Sea urchin
Match the following stages of sleep with their descriptions:
A) Stage 2 B) Stage 1 C) Stage 3 D) REM E) Stage 4 1) The stage when vital signs (blood pressure, heart rate, and body temperature) reach their lowest normal levels. 2) Indicated by movement of the eyes under the lids; dreaming occurs. 3) Theta and delta waves begin to appear. 4) Very easy to awaken; EEG shows alpha waves; may even deny being asleep. 5) Typified by sleep spindles. 6) Begins about 90 minutes after the onset of sleep. 7) Necessary for emotional health; may be neural "debugging."
An egg-bearing animal is said to be:
A) egg bound B) oviparous C) viviparous D) oviladen