To improve communication between two neurons, it is necessary in many cases to have a healthy
A. synaptic neuron.
B. interneuron.
C. sensory neuron.
D. motor neuron.
E. Schwann cell.
B. interneuron.
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Otto Loewi demonstrated that neurons transmit signals across synapses by ____
a. electrical signals b. calcium channels c. acetylcholine d. chemical signals e. proteins
Inflowing river waters most often impoverish rather than fertilize estuaries
Indicate whether the statement is true or false
Adult tunicates resemble __________ and are __________
a. eels; carnivorous. b. corals; photosynthetic c. starfish; carnivorous d. sponges; filter feeders e. earthworms; detritivores
Researchers have found that mixtures of phospholipids placed in water or salt solutions tend to spontaneously form:
A. RNA molecules. B. DNA molecules. C. ATP. D. small spherical units that resemble living cells.