Module lab 3

pdf

School

Metropolitan Community College, Kansas City *

*We aren’t endorsed by this school

Course

MISC

Subject

Biology

Date

Jan 9, 2024

Type

pdf

Pages

Uploaded by ChiefOxideAlbatross37

1 Module 3 Lab-Class Part 1: Microscopic Anatomy of the Muscular System Muscle Tissue - Slides Obtain slides of skeletal (striated) muscle and smooth muscle. Skeletal muscle slide Look at the skeletal muscle slide on 10X then 40X power. Find an area on the slide where you are able to see the light and dark banding pattern well. Notice the location of the nuclei. Notice the location of the nuclei. Include pictures/illustrations below. Briefly describe the structural features of the 1) muscle organ, 2) muscle fiber, 3) myofbril, and 4) myofilament. Muscle organ: Muscle organs are comprised of many muscle fibers put together. Muscle fiber: Muscle fibers are many myofibrils put together. Myofibril: Myofibrils are many myofilaments put together Myofilament: Myofilaments are long strands of sarcomeres that are one of the smallest unit of muscle cells.

2 Smooth muscle slide The slide of smooth muscle is a cross section of intestine. The smooth muscle is the red stained tissue that makes up a circle around the epithelial tissue of the intestine. Focus on the muscle tissue and increase the magnification to 40X. Include pictures/illustrations below. How does the smooth muscle differ from the appearance of the skeletal muscle? Smooth muscle lacks the visible striation. Part 2: Skeletal Muscles

3 Describe the functions of each of the following muscles. In your descriptions, include the appropriate anatomical terminology for the movements. 1. Buccinator— It stabilizes the denture by gripping and holds the bolus of food between your teeth. 2. Epicranius—It allows you to elevate your eyebrows, wrinkle your forehead, and retract your scalp. 3. Lateral pterygoid— It depresses the mandible and opens your mouth. 4. Platysma— It moves your lower jaw and forms many facial expressions. 5. Rhomboideus major— It retracts, elevates, and rotates your scapula. 6. Splenius capitis— It supports the head in the erect position. 7. Temporalis— It produces movement of the mandible and closes the jaw. 8. Zygomaticus— It pulls the angle of the mouth superolateral, which facilitates speech and facial expressions. 9. Biceps brachii— It allows for flexion and supination of the forearm. 10. Brachialis— It provides flexion at the elbow. 11. Deltoid— It helps you move your arm in different directions, while also protecting and stabilizing your shoulder. 12. Latissimus dorsi— It adducts and medially rotates your shoulder. 13. Pectoralis major— It allows for the flexion, adduction, and internal rotation of the humerus. 14. Pronator teres—It pronates the forearm and assists in flection at the elbow. 15. Teres minor— It rotates the arm at the shoulder joint and stabilizes the ball and socket of your elbow. 16. Triceps brachii— It allows for extension of the elbow joint. 17. Biceps femoris— It allows for the movement of the hip at the knee joint. 18. External oblique— It rotates the trunk, and also lets you pull your chest down and compress the abdominal cavity. 19. Gastrocnemius— It flexes the knee and foot. 20. Gluteus maximus— It allows for the extension and external rotation of the hip joint. 21. Gluteus medius— It allows for flexion and medial rotation of the hip. 22. Gracilis— It assists with hip adduction, knee flexion, and the internal rotation of the knee. 23. Rectus femoris— It flexes the hip and extends the lower leg at the knee. 24. Tibialis anterior— It is the primary dorsiflexor at the ankle.

Your preview ends here