Some of these figures and pages may be copyright protected. I take no responsibility for matters related to copyright laws and regulations. Use these at your own discretion.

Augustine DiGiovanna, Ph.D.

Fig. 8.1 Skeletal muscles in the muscle system.

https://upload.wikimedia.org/wikipedia/commons/1/13/Muscular_system.svg

https://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Muscular_system-back.svg/171px-Muscular_system-back.svg.png

Fig. 8.2 Components of a skeletal muscle.

https://upload.wikimedia.org/wikipedia/commons/d/dd/1007_Muscle_Fibes_%28large%29.jpg

https://i.pinimg.com/originals/e5/8f/dd/e58fddcc14dffafc7b75b6398eab2b14.jpg

https://www.karunayoga.in/wp-content/uploads/2017/09/4.-Skeletal-muscle-structure.jpg

https://i.pinimg.com/originals/e4/af/32/e4af32b617c4e5be9477caeb419db183.jpg

Fig. 8.3 Components of a muscle cell.

https://upload.wikimedia.org/wikipedia/commons/5/57/1009_Motor_End_Plate_and_Innervation.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Ca2%2B_sparks.jpg/1280px-Ca2%2B_sparks.jpg

https://upload.wikimedia.org/wikipedia/commons/6/6f/Blausen_0801_SkeletalMuscle.png

https://upload.wikimedia.org/wikipedia/commons/6/63/1010a_Contraction_new.jpg

Fig. 8.4 Obtaining energy in muscle cells.

Fig. 8.5 Myofilaments and the process of contraction: (a) Contraction begins. (b) Contraction ends. Sarcomeres and cells are shorter.

https://upload.wikimedia.org/wikipedia/commons/c/c6/1006_Sliding_Filament_Model_of_Muscle_Contraction.jpg

VIDEOS

“Muscle Contraction and Locomotion”

NOTE: Error !!! At the end of contraction, the myofilaments do NOT slide back to their original positions. They must be puller back to their original position by an external force, such as another muscle, body elasticity, or gravity.

https://courses.lumenlearning.com/suny-biology2xmaster/chapter/muscle-contraction-and-locomotion/

Fig. 8.6 Motor units.

https://upload.wikimedia.org/wikipedia/commons/1/1b/Motor_unit.png

https://i.pinimg.com/originals/72/97/d7/7297d7065d60cca7c1436fe334c09be1.jpg

https://upload.wikimedia.org/wikipedia/commons/2/2e/The_Muscle_Contraction_Process.png

©  Copyright 2020: Augustine G. DiGiovanna, Ph.D., Salisbury University, Maryland
The materials on this site are licensed under CC BY-NC-SA 4.0

Attribution-NonCommercial-ShareAlike
This license requires that reusers give credit to the creator. It allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, for noncommercial purposes only. If others modify or adapt the material, they must license the modified material under identical terms.
Previous print editions of the text Human Aging: Biological Perspectives are © Copyright 2000, 1994 by The McGraw-Hill Companies, Inc. and 2020 by Augustine DiGiovanna.
View License Deed | View Legal Code