Physiology of Muscle Contraction

Generating the force or movement in response to a physiological stimulus is the primary function of?

• Heart

• Muscles

• Lungs

• Organs

What is the basic rod-like unit of muscle fiber?

• Myofibrils

• Transverse Tubules

• Myofilament

• Fascicles

The contraction and then relaxation of a muscle in response to a stimulus that causes an action potential in one or more muscle fibers.

• Muscle Contraction

• Muscle Twitch

• Muscle Stitch

• Muscle Fatigue

Muscle Contractions- when tension remains the same, muscles shorten, used in movement.

• Isometric

• Isotonic

• Oblique

The maximum force generated by a muscle depends on the relative proportions of ____ fibers that make up the muscle.

• Type 1

• Type 2

• Type 1 and 2

____________ and _____ produce muscle contraction.

• Collagen and elastin

• Actin and myosin

• Calcium and potassium

• Glucose and oxygen

What two chemicals induce muscle contraction

• Potassium ions and creatine

• Calcium ions and ATP

• Sodium ions and glucose

• Magnesium ions and lactic acid

What is the role of ATP in muscle contraction?

• ATP is a waste product of muscle contraction.

• ATP inhibits the interaction between actin and myosin.

• ATP is only needed for muscle relaxation.

• ATP is essential for muscle contraction as it provides the energy for the interaction between actin and myosin.

What do all muscle types require for contraction?

• Na+

• Ca2+

• K+

• Mg2+

What is the role of myosin in muscle contraction?

• It binds to calcium ions

• It forms cross-bridges with actin

• It stores energy

• It breaks down ATP