chapter 3 Flashcards
(6 cards)
1
Q
1 cell is __+__=____
A
23+23=46
2
Q
____ genes
A
20,000
3
Q
dna ___%
A
99%
4
Q
name three types of neurons
A
1 sensory neurons
2 motor neurons
3 interneurons
5
Q
how do neurons communicate
A
signals
6
Q
endocrine system
A
communicates by glands or hormones chemical messages
