ANATOMY 2A QUIZ 4.2 Answers

1. Name the type of muscle below that does not contain the vertical striations seen in this picture: Skeletal muscle Cardiac muscle Smooth muscle Visceral muscle Both c and d

2. What is the name of the structure at the pointer and identity of the type of muscle below: Striations/Skeletal muscle IC disc/Cardiac muscle Muscle tear/Smooth muscle Visceral muscle Both c and d

3. What muscle is antagonistic to muscle #3 ? a) Trapezius. Sternocleidomastoid. Pectoralis minor. Serratus anerior. Rhomboideus minor. 3 1

sarcoplasmic reticulum 4. Identify structure A and name the ion that travels within it. T-tubules containing Na+ ions A. myofibril sarcoplasmic reticulum

5 A band H zone Z line I band M zone 5. Name region #5. Is this muscle partially contracted ? Explain. Contracted due to actin overlapping in the H zone A band H zone Z line I band M zone

Which of the following must occur in order for the Na+ gates to open and generation of an action potential within skeletal muscle? a) Repolarization. b) Propagation of nerve impulse down the muscle fiber. c) Ach binding to the motor end plate. d) A sudden positive change in membrane potential. e) None of the above.

7. Name the muscle at the arrow: Rectus abdominis Transversus abdominis External oblique Internal oblique Latissimus dorsi

8. The main action of muscle # 8 is: Extends the arm at the shoulder joint Stabilizes the shoulder joint Abducts the arm at the shoulder joint Extends the elbow Adducts the arm at the shoulder joint 8

9. Which of the following are the correct actions of muscle #9? Adducts and flexes the forearm Extends and medially rotates the arm at the shoulder Abducts the arm at the shoulder Adducts and extends the arm at the shoulder Adducts and flexes the arm at the shoulder 9

10. Name the white connective tissue that would compartmentalize the structure at the arrow. Endomysium Epimysium Perimysium Fascia Both b and d

11. Which of the following muscles are rotator cuff muscles 11. Which of the following muscles are rotator cuff muscles? Choose every letter that applies. Infraspinatus Subscapularis Trapezius Supraspinatus Teres minor

12. What muscle is a synergist to muscle #12? Buccinator Masseter Orbicularis oris Temporalis Zygomaticus 12

13. Name the muscle at the arrow. Rectus abdominis Transversus abdominis External oblique Serratus anterior Latissimus dorsi

14. The main action of muscle # 14 is: Extends the arm at the shoulder joint Stabilizes the elbow joint Abducts the arm at the shoulder joint Extends the elbow Adducts the arm at the shoulder joint 14

15 15. Name muscle #15 Teres minor Sternocleidomastoid Pectoralis minor Serratus anterior Coracobrachialis 15

16. Which of the following states the correct actions of muscle #16? Adducts and flexes the arm at the shoulder joint Extends and medially rotates the arm at the shoulder Abducts the arm at the shoulder Adducts and extends the arm at the shoulder Abducts and extends the arm at the shoulder 16

17. Name muscle #17 17 Levator scapulae Trapezius Rhomboideus major Rhomboideus minor Supraspinatus 17

18. Name the type of muscle below and write two characteristics that are unique to this muscle type: Voluntary and multi-nucleated Skeletal muscle Cardiac muscle Smooth muscle Visceral muscle Both c and d

19. What is the insertion of muscle #19 ? Lateral clavicle Vertebrae Iliac crest Anterior humerus Spine of scapula 19

20. Identify muscle A. What group of muscles, medial to region A, would act upon the fingers ?Flexors All antebrachial muscles Flexor digitorum muscles Extensor muscles Thenar muscles Brachioradialis A Supine position

21. Name muscle #21 21 Orbicularis oculi Orbicularis oris Buccinator Frontalis Zygomaticus major 21

22. Which of the following muscles originates at two separate points on the scapula and inserts on the proximal radius? Triceps brachii Coracobrachialis Biceps brachii Brachioradialis Subscapularis

23 23. Name region #23 A band H zone Z line I band M line

24. Name the white connective tissue at the arrow Endomysium Epimysium Perimysium Fascia Both b and d

25. Which of the following are correct actions of muscle #25 ? Pulls scapula towards the ribs Elevates the scapula Abducts the arm at the shoulder joint Flexes the vertebrae Flexes the head 25