1. Baseball The Muscular System
Compete against another player…..don’t forget to note any questions that are missed!

2. What role does ATP play in muscle contraction?
Questions:
What role does ATP play in muscle contraction?
Answer: it is the source of energy for the sliding filaments
Which muscle allows you to wrinkle your forehead?
Answer: frontalis

3. What structures connect muscles to bone?
Questions:
What structures connect muscles to bone?
Answer: tendons
Where is smooth muscle located? Cardiac?
Answer: smooth: hallow organs (stomach, intestine, etc) cardiac:heart

4. What is the minimal strength needed for muscle contraction?
Questions:
Define origin & insertion points
Answer: origin :immovable or less movable point of attachment (muscle to bone) insertion: movable point of attachment
What is the minimal strength needed for muscle contraction?
Answer: threshold

5. Why does skeletal muscle look striated?
Questions:
What is a recording of an electrically stimulated isolated muscle called?
Answer: myogram
Why does skeletal muscle look striated?
Answer: alternating layers of light and dark bands

6. Which diagram shows a relaxed sarcomere, 8,9 or 10? Explain why
Questions:
Which diagram shows a relaxed sarcomere, 8,9 or 10? Explain why
Answer: 10…..z lines are far apart, long sarcomere

7. During what time interval would the latent period occur?
Questions:
During what time interval would the latent period occur?
Answer: msec

8. Questions:
Identify area 6 & indicate the role it plays in muscle contraction.
Answer: Mitochondrion… supplies ATPs

9. When muscles decrease in size or seem to waste away this is called.
Questions:
What type of summation is indicated by the myogram?
Answer: tetanic contraction
When muscles decrease in size or seem to waste away this is called.
Answer: atrophy

10. Questions:
Identify the fleshy muscle that runs across the cheek…whistling & chewing muscle
Answer: Buccinator
Increasing the angle between to bones is best known as flexion, true or false?
Answer: false….extension

11. Questions: Identify the area labeled # 5 & 6
Answer: biceps brachii & external obliques
Gluteus maximus was named how (2 reasons)
Answer: gluteal (body region) & size (maximus=large)

12. Questions: Identify the area labeled # 5 & 6 What is oxygen debt?
Answer: deltoid & trapezius
What is oxygen debt?
Answer: the amount of oxygen required to convert built up lactic acid into glucose

13. Questions: Identify the area labeled # 1 & 4
Answer: gluteus medius & gastrocnemius
Why do actin and myosin come in contact with eachother only some of the time?
Answer: Binding site on actin is covered up…preventing contact

14. Questions: Identify area 7 & what is found within it?
Answer: synaptic vesicles contains neurontransmitters (like acetylcholine)

15. Questions: Identify the area labeled # 10
Answer: bucinnator
Which muscle helps you wink? (name and number it)
Answer: orbicularis oculi #2

16. Questions: Identify the area labeled # 1 and indicate its function
When a muscle can no longer contract it is said to be….
Answer: fatigued
Identify the area labeled # 1 and indicate its function
Answer: sternocleidomastoid allows you to bow your head

17. Questions: Identify the area labeled # 8 & indicate the action on #5
Answer: sartorius & dorsiflexion of the foot (tibialis anterior)
Identify the area labeled # 2 to which group of muscles does this belong ?
Answer: Vastus medialis…. quadriceps

18. Questions:
If a muscle fiber contracts at all, it will contract completely…. This is also known as
Answer: all or none theory
Identify by name & number the muscles that comprise the hamstrings
Answer: biceps femoris semitendinosus 7-semimembranosus

19. Questions: Identify the area labeled # 5
Answer: zygomaticus
Which muscle helps you kiss? (name and number it)
Answer: orbicularis oris #6

20. Questions: Identify the area labeled # 4 & 6
Answer: latissimus dorsi & triceps brachii
When several muscles contract at a time, the one muscle responsible for the majority of movement is called
Answer: the prime mover

21. Questions: Identify the area labeled # 1, 2 &3
Answer: 1:A (dark) band : I (light) band : H zone
What kind of muscle opposes or reverses a movement?
Answer: antagonists

22. Questions: Identify Area #3 What substance is #4 & 6? Answer: Z Line
Answer: Actin & Myosin

23. Questions: Identify the area labeled # 4 & 6
Answer: soleus & peroneus
One neuron and all the skeletal muscle cells it stimulates is called a
Answer: motor unit

24. Questions:
Order the events from first to last A. Acetylcholine is released from axonal terminal into synaptic cleft B. Sarcomeres contracts c. Depolarization triggers action potential, travels along sarcolemma & T tubules D. motor end plate is depolarized E. Action potential arrives at axonal terminal
Answer: E-->A-->D-->C--->B

25. An increase in the number of motor units being activated is called
Questions:
Even when a muscle is at rest, its fibers usually remain partially contracted this is called….
Answer: muscle tone
An increase in the number of motor units being activated is called
Answer: recruitment