1. Clicker Review: Unit 4 Muscular System

2. Which of the following is not a function of the muscular system?
Movement
Thermogenesis
Maintain posture
Support joints
All are functions

3. Muscle fibers are considered “excitable.” What does this mean?
They can shorten & thicken
They can produce electrical signals
They can elongate without damaging the tissue
The can return to their original position

4. Which of the following is not a difference between the 3 types of muscular tissue?
Smooth & cardiac tissue contract involuntarily but skeletal tissue contracts voluntarily
Smooth & cardiac tissue have 1 nucleus but skeletal tissue is multinucleated
Smooth & cardiac muscle cells are joined by electrical junctions but skeletal muscle cells are joined by neuromuscular junctions
Both 1 & 2
Statements #1-3 are true.

5. Muscle cells are called…?
myofibrils
myofilaments
fibers
sarcomeres

6. The immovable end of a muscle is called the …?
Insertion
Proximal tendon
Distal tendon
Origin

7. Muscles that contract and assist the prime mover are called…
Agonists
Synergists
Antagonists
Fixators

8. What is this called?
perimysium
epimysium
endomysium
Fasicle
Fascia

9. What is this called?
perimysium
epimysium
endomysium
Fasicle
Fascia

10. What is this called?
perimysium
epimysium
endomysium
Fasicle
Fascia

11. What proteins make up the “thin” filaments?
Myosin, actin, myofilaments
Myosin, actin, troponin, tropomyosin
Actin, troponin, tropomyosin
troponin, tropomyosin

12. What is this synapse called?
Motor endplate
Chemical synapse
Neuromuscular junction
Neurotransmitter junction

13. What is this structure? Muscle fiber Sensory cell Motor neuron
None of the above

14. What are the “circles?” vesicles neurotransmitters mitochondria
Acetylcholine receptor sites

15. The blue line (muscle fiber cell membrane) is called?
Sarcoplasmic reticulum
Sarcolemma/motor end plate
Sarcomere
None of the above

16. What is the functional unit of a muscle?
Sarcomere
Neuromuscular junctions
Muscle fibers
Actin and myosin

17. When 1 neuron (nerve cell) sends a signal to 25 muscle fibers, this group is called a what?
Nerve group
Neurotransmitter cluster
Motor unit

18. What makes up the red line?
Actin
Myosin
Troponin
Myofibril

19. The myofilaments have decreased in length to achieve contraction.
TRUE
FALSE

20. What causes Myosin to release from Actin?
Troponin
Tropomyosin
ATP
Calcium

21. What pulls the actin filaments inwards to shorten a muscle?
Sarcomeres
Myosin
Sarcoplasmic reticulum
T-tubule

22. When the nervous impulse stops, what happens?
Tropomyosin is moved & uncovers the myosin binding sites
Acetylcholine is released into the synaptic cleft
ATP is no longer produced
Calcium is pumped back into the sarcoplasmic reticulum

23. What is the name of this muscle?
Masseter
Semitendonosous
Zygomaticus
Platysma
Serratus anterior

24. What is the name of another muscle that helps you smile?
Buccinator
Semitendonosous
Trapezius
Platysma
Risorius

25. What is the name of this muscle?
Masseter
Platysma
Obicularis oris
Buccinator
Rectus femoris

26. What is the name the muscle that causes you to frown between eyebrows?
Serratus anterior
Procerus
Masseter
Termporal
Gracilis

27. What is the name of this muscle?
Serratus anterior
Rectus abdominus
Vastus lateralis
External abdominal oblique
Gracilis

28. What is the name of this muscle?
Soleus
Gastrocnemius
Vastus lateralis
Sartorius
Gracilis

29. What is the name of this muscle?
Vastus medialis
Semitendonosus
Semimembranosus
Biceps brachii
Biceps femoris