BIOL&251Ch10NotesSpr11

BIOL&251Ch10Note - Ch 10 Muscle Tissue and Muscle Physiology A brief review from Ch 4 there are 3 types of muscle tissue 1 Cardiac muscle is

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Ch. 10 – Muscle Tissue and Muscle Physiology • A brief review from Ch. 4: there are 3 types of muscle tissue… –1 . Cardiac muscle is striated and involuntarily controlled • It’s found in the walls of the heart • It functions to pump blood –2 . Smooth (visceral) muscle is nonstriated and involuntarily controlled • It’s found in the walls of hollow organs • It functions to move eggs, sperm, urine, food, hairs, etc. throughout the body –3 . Skeletal muscle is striated and voluntarily controlled • It’s attached to bone or fascia Skeletal muscle is the major focus of this chapter • It has many functions (see the next slide)… Skeletal muscles • = organs that are made up mainly of skeletal muscle tissue, but also CTs, nerves, and blood vessels – Each skeletal muscle cell is called a muscle fiber • Functions of skeletal muscles : – 1. Produce skeletal movement – 2. Maintain posture and body position –3 . Support soft tissues • E.g. the floor of pelvic cavity – 4. Guard entrances and exits • E.g. the upper part of the esophagus, the external anal sphincter, and the external urethral sphincter – 5. Produce
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Fig. 10-1, p. 295 Organization of CTs in skeletal muscles Skeletal muscles (as a whole): – Are surrounded by epi mysium , which is… • Dense irregular CT • Connected to deep fascia – Are subdivided into many compartments called fascicles Part 1 Fig. 10-1, p. 295 Organization of CTs in skeletal muscles Fascicles : –A re surrounded by peri mysium , which… • Is dense irregular CT • Also contains blood vessels and nerves – Contain many individual muscle fibers
Background image of page 2
3 Fig. 10-1, p. 295 Organization of CTs in skeletal muscles Muscle fibers : – Are surrounded by endo mysium , which… • Is areolar CT • Contains capillaries, nerve fibers (axons), and… Myosatellite cells = stem cells that function in muscle development, repair, and perhaps growth (via hyperplasia) – Contain long, contractile protein- filled cylindrical structures called myofibrils Part 3 Fig. 10-1, p. 285 A summary of the CTs in skeletal muscles All 3 “–mysiums” fuse together at the end of the muscle to form a tendon , which… – Connects muscle to bone – Is continuous with the periosteum of bone – Is called an aponeurosis if it’s a broad, flat tendon
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fig. 10-2, p. 296 More about skeletal muscle fibers They are… – A.k.a. muscle cells or myofibers – Formed by the fusion of embryonic myoblast cells Extremely large – up to a foot long and 10X the diameter of a typical cell! – Multinucleate and striated Fig. 10-3, p. 297 Skeletal muscle fiber structure Sarcolemma = the cell membrane of a muscle fiber – “Sarco” = “flesh”; “lemma” = “husk” Transverse (T) tubules = deep invaginations of the sarcolemma, which… • Are continuous with the sarcolemma • Carry action
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/29/2011 for the course BIOLOGY 24011 taught by Professor Pan during the Fall '11 term at HCCS.

Page1 / 31

BIOL&251Ch10Note - Ch 10 Muscle Tissue and Muscle Physiology A brief review from Ch 4 there are 3 types of muscle tissue 1 Cardiac muscle is

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online