KIN 474 Exam 1 Review

Which anatomical plane divides the body into left and right sections?

• Frontal

• Sagittal

• Transverse

• Vertical

The ________ are located in the muscle belly.

• Golgi Tendon Organ

• Muscle Spindles

• Relaxation Neurons

What molecule must be released to activate actin filaments?

• Action potential

• Potassium

• Calcium

• ATP

What molecule binds with calcium?

• Tropomyosin

• Troponin

The sarcomere is the _______ contractile unit of the cell.

• largest

• smallest

The size principle states that ____ -threshold motor units are recruited first.

• high

• low

The size principle states that Type ___ muscle fibers are recruited first.

• I

• II

Type I muscle fibers have all the following characteristics except

• High capillary density

• Fatigue resistance

• High contraction speed

• High aerobic enzyme content

Bradycardia is defined as a heart rate

• lower than 70

• lower than 60

• higher than 100.

• higher than 120

The ____ node is the pacemaker of the heart.

• AV node

• SA node