Question 1
Put these myofibers in the order they would be recruited as the body moves from a weak to a strong stimulus:
1. glycolytic fast-twitch fibers
2. fatigue-resistant oxidative fast-twitch fibers
3. fatigue-resistant slow-twitch fibers
◦ 1, 2, 3
◦ 1, 3, 2
◦ 2, 3, 1
◦ 3, 2, 1
◦ 3, 1, 2
Question 2
An important difference between single-unit and multiunit smooth muscle is the
◦ numerous gap junctions in single-unit smooth muscle, which allow many cells to work together as a sheet.
◦ ability of single-unit fibers to change into multiunit fibers when needed.
◦ closely controlled individual fibers in single-unit smooth muscle to allow fine control and graded contractions by selective activation.
◦ longer actin and myosin filaments in multiunit smooth muscle, which allow coordination of contraction.
Cardiac Muscle
Some biologically important hydrogen bonds
Unit of blood.
Important Motor Regions of the Human Brain
One Minute Sit-up Test for Abdominal Muscle Strength and Endurance.
Sternocleidomastoid muscle movement