Chapter_10_Muscle_Tissue.pptx - Anatomy and Physiology...

  • No School
  • AA 1
  • 66

This preview shows page 1 - 12 out of 66 pages.

Biology 2401 Anatomy and Physiology Chapter-10 Muscle Tissue
Image of page 1

Subscribe to view the full document.

General Characteristics Myology: study of muscles Movement results from a combination of contraction and relaxation of musculature During muscle work, chemical energy is converted to mechanical energy Each skeletal muscle is a separate organ composed of individual muscle cells called myofibers or fibers , connective tissue wrappers, blood vessels, and nerves
Image of page 2
Properties of Muscles Contractility : ability of a muscle to shorten or exhibit force Conductivity : ability to propagate electrical signals over membrane Excitability : capacity of a muscle to respond to a stimulus Extensibility : muscle can be stretched beyond its normal resting length Elasticity : ability of muscle to recoil after being stretched beyond its normal length
Image of page 3

Subscribe to view the full document.

Muscular System Functions Body movement Maintenance of posture Respiration Production of body heat Communication Constriction of organs and vessels; sphincters Movement of substances through the body: blood, lymph, urine, air, food and digestive fluids, sperm Heart beat
Image of page 4
Types of Muscle Tissue Skeletal (primary emphasis of this chapter) Cardiac Smooth
Image of page 5

Subscribe to view the full document.

Skeletal Muscle Attached to bone, skin, or fascia Under microscope, striated with light and dark bands Peripherally located multiple nuclei Voluntary control of contraction and relaxation Some skeletal muscles contribute to involuntary reflex behaviors
Image of page 6
Cardiac Muscle Found in the heart Single nucleus centrally located Striated Involuntary. Autorhythmic contraction because of modified cardiac muscle cells that act as a pacemaker Intercalated discs : cell junctions that contain desmosomes and gap junctions
Image of page 7

Subscribe to view the full document.

Smooth Muscle Found in the walls of hollow organs, blood vessels, the eye, glands, and skin Single nucleus centrally located Not striated, involuntary
Image of page 8
Skeletal Muscle: Connective Tissue Components Superficial fascia : areolar connective tissue and fat deep to dermis (subcutaneous layer, hypodermis) Deep fascia : dense irregular connective tissue wrapped around muscles; lines body wall and extremities Functions of deep fascia Hold muscles together yet separates them into functional groups Allow free movement of muscles Carries nerves (motor neurons, sensory neurons), blood vessels, lymphatics
Image of page 9

Subscribe to view the full document.

Connective Tissue, cont External lamina : delicate, reticular fibers surrounding each fiber Endomysium : loose connective tissue with reticular fibers surrounding each fiber Perimysium : denser connective tissue surrounding a group of muscle fibers. Each group: fascicle Epimysium : connective tissue surrounding a whole muscle; many fascicles Endo-, peri-, and epimysium extend beyond the belly of the muscle to form the tendon
Image of page 10
Tendons and Aponeuroses Tendon : attaches muscle to periosteum of bone or some other attachment site.
Image of page 11

Subscribe to view the full document.

Image of page 12
  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes