Lecture+22+Muscle+Physiology+Part+II

Cardiac muscle sustains each impulse longer than in

This preview shows page 28 - 35 out of 35 pages.

Cardiac muscle sustains each impulse longer than in skeletal muscle; therefore, impulses cannot come rapidly enough to produce tetanus. Cardiac muscle does not run low on ATP and does not experience fatigue. Cardiac muscle is self-stimulating. Cardiac Muscle Tissue 28 Saturday, June 18, 2011
Image of page 28

Subscribe to view the full document.

29 Saturday, June 18, 2011
Image of page 29
Smooth muscle is composed of small, tapered cells with single nuclei. No T-tubules are present, and only a loosely organized sarcoplasmic reticulum is present. Ca ++ comes from outside the cell and binds to calmodulin instead of troponin to trigger a contraction. No striations, because thick and thin myofilaments are arranged differently than in skeletal or cardiac muscle fibers; myofilaments are not organized into sarcomeres. Smooth Muscle Tissue 30 Saturday, June 18, 2011
Image of page 30

Subscribe to view the full document.

There are two types of smooth muscle tissue called single-unit and multiunit, respectively. Single-unit or visceral smooth muscle tissue has gap junctions joining smooth muscle fibers into large, continuous sheets. It is the most common type and forms a muscular layer in the walls of hollow structures such as the digestive, urinary, and reproductive tracts. It also exhibits autorhythmicity , producing peristalsis. Multiunit smooth muscle does not act as a single unit but is composed of many independent cell units. Each fiber responds only to nervous input. Single-Unit & Multiunit 31 Saturday, June 18, 2011
Image of page 31
Single-Unit 32 Saturday, June 18, 2011
Image of page 32

Subscribe to view the full document.

Multiunit 33 Saturday, June 18, 2011
Image of page 33
Proper function of all three major types of muscle is integral to the function of the entire body and maintaing homeostasis. All three types of muscle tissue provide the movement necessary for survival. Relative constancy of the body’s internal temperature is maintained by “waste” heat generated by muscle tissue. Maintains the body in a relatively stable position. The Big Picture 34 Saturday, June 18, 2011
Image of page 34

Subscribe to view the full document.

The End 35 Saturday, June 18, 2011
Image of page 35

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

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