Question

FIGURE 12.3 Skeletal muscle fiber. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. (a) Skeletal muscle fiber • myofibril (myo-FY-bril) • sarcolemma (sar-co-LEM-ma) • sarcoplasmic reticulum (sar-co-PLAZ-mic re-TIC-u-lum) • terminal cisterns (cis-TER-nee) • T tubule (b) Thick and thin filaments • sarcomere • thick filament • thin filament (c) Contractile proteins • myosin (MY-oh-sin) heads • myosin tails • tropomyosin (tro-poh-MY-o-sin) • troponin FIGURE 12.3 Skeletal muscle fiber, continued. (b) Thick and thin filaments (c) Contractile proteins Myosin heads Myosin tail 10 11 12 13 14 Z disc M line Before Going to Lab 1. Label the skeletal muscle fiber in Figure 12.3. EXERCISE 12 SKELETAL MUSCLE STRUCTURE 179 Int. Muscle fiber Sarcolemma Z disc Mitochondrion Sarcomere Thick Filament (myosin) Thin Filament (actin) 1 2 3 4 5 6 7 8 9 10 11 12 13 14

          FIGURE 12.3 Skeletal muscle fiber.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
(a) Skeletal muscle fiber
• myofibril (myo-FY-bril)
• sarcolemma (sar-co-LEM-ma)
• sarcoplasmic reticulum
(sar-co-PLAZ-mic re-TIC-u-lum)
• terminal cisterns (cis-TER-nee)
• T tubule
(b) Thick and thin filaments
• sarcomere
• thick filament
• thin filament
(c) Contractile proteins
• myosin (MY-oh-sin) heads
• myosin tails
• tropomyosin (tro-poh-MY-o-sin)
• troponin
FIGURE 12.3 Skeletal muscle fiber, continued.
(b) Thick and thin filaments
(c) Contractile proteins
Myosin heads
Myosin tail
10
11
12
13
14
Z disc
M line
Before Going to Lab
1. Label the skeletal muscle fiber in Figure 12.3.
EXERCISE 12 SKELETAL MUSCLE STRUCTURE 179
Int. Muscle fiber
Sarcolemma
Z disc
Mitochondrion
Sarcomere
Thick Filament
(myosin)
Thin Filament
(actin)
1
2
3
4
5
6
7
8
9
10
11
12
13
14

figure 123 skeletal muscle fiber 1 2 3 4 5 6 7 8 9 10 11 12 13 14 a skeletal muscle fiber myofibril myo fy bril sarcolemma sar co lem ma sarcoplasmic reticulum sar co plaz mic re tic u lum t 81172

Added by Trinidad G.

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