Test 2

24. Which area of the graph shows when voltage-gated sodium are open?

A) 2

10. Identify the muscle labeled "7."

A) anconeus

7. Identify the muscle labeled "2."

A) deltoid

14. The structures labeled "1" are____. Their membranes contain numerous chemically-gated ion channels.

A) dendrites

15. The structure labeled "2" is a

A) soma & D) perikaryon

21. On which structure do most neuron to neuron communications occur?

B) 1

23. Which area of the graph shows when chemically-gated sodium channels are open?

B) 1

25. Which area of the graph occurs when there is a sudden rush of sodium ions into the neuron?

B) 2

2. Identify the structure at label "1."

B) bursa

13. Identify the muscle labeled "12."

B) gastrocnemius

3. Identify the structure labeled "2."

B) synovial membrane

17. Identify the structure labeled "4."

B) telodendria

6. Identify the muscle labeled "1."

B) trapezius

4. What type of tissue occurs at the structure labeled "3"?

C) articular cartilage

22. What is occurring at the area labeled #4?

C) excessive potassium has diffused out causing hyperpolarization

8. Identify the muscle labeled "3."

C) infraspinatus

9. Identify the muscle labeled "6."

C) latissimus dorsi

20. Which part of the neuron can propagate an action potential?

D) 3

1. Which structure acts as a cushion and consists of fibrous cartilage?

D) 4

26. When is the neuron in the refractory period?

D) 4

12. Identify the muscle labeled "11."

D) biceps femoris

11. Identify the structure labeled "9."

D) iliotibial tract

18. Identify the structure labeled "5."

D) synaptic terminals

16. Which type of membrane channels are found at label "3"?

E) both voltage-gated Na+ channels and voltage-gated K+ channels

5. Identify the structure labeled "5."

E) intracapsular ligament

19. What is contained inside the structure labeled "5"

E) neurotransmitter molecules