Bio notes 9 - Notes Topic The Musculo-Skeletal System...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Topic: The Musculo-Skeletal System Reading: Chapter 39 Main concepts : Muscles and the skeleton work together to produce locomotion. Muscles contain contractile fibers that cause them to contract; the skeleton provides support for the body and a place to anchor muscles that cause movement. Three types of muscle tissue: Skeletal: striated muscle capable of voluntary movement. Smooth: non-striated muscle not directly under conscious control. Cardiac: striated muscle cells connected end-to-end, capable of electrical coordination. Muscle cells (fibers) contain myofibrils. Myofibrils contain two types of protein fibers: “thick,” made up of strands of myosin protein, and “thin,” made up of strands of actin protein with tropomysin and troponin proteins. Myosin strands have small “heads” that literally crawl along the actin strands. This is the basis of muscle contraction. Each movement of the myosin “head” requires one ATP, which is why muscles use up a lot of the body’s ATP. This function of muscular movement requires the input of calcium ions. Two types of muscle fibers: Slow-twitch: Slow to contract. Contain abundant mitochondria, and store myoglobin (an oxygen-storing protein similar to hemoglobin), which make these fibers dark. They are useful for endurance activities, such as long-distance running. “Dark meat” on a turkey. Fast-twitch: Contract quickly. These have fewer mitochondria and less blood supply, but make better use of glycolysis to operate in low oxygen conditions. These cells are lighter in color, and are useful for activities requiring a burst of energy, such as sprinting or weight lifting. “White meat” on a turkey.
Background image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 2

Bio notes 9 - Notes Topic The Musculo-Skeletal System...

This preview shows document pages 1 - 2. Sign up to view the full document.

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