07.02 - Skeletal Muscles: Crash Course

What is the function of skeletal muscles?

• To aid in digestion

• To secrete hormones

• To produce movement

• To regulate body temperature

How many skeletal muscles are there in the human body?

• 320

• 500

• 800

• 640

Which muscle is the biggest in the human body?

• Sartorius

• Gluteus maximus

• Stapedius

• Pectoralis major

What is the insertion point of a muscle?

• The bone that moves

• The bone that doesn't move

• The muscle's antagonist

• The muscle's origin

What is the function of antagonist muscles?

• To produce movement

• To stabilize joints

• To relax

• To increase force

What are synergist muscles responsible for?

• Relaxing

• Stabilizing joints

• Increasing force

• Producing movement

What is a motor unit?

• A group of bones

• A group of muscle fibers

• A type of joint

• A type of neuron

What is the latent period in a muscle twitch?

• When the force is produced

• When the stimulus arrives

• When the muscle contracts

• When the muscle relaxes

What is the process called when multiple action potentials don't travel down all the motor neurons at exactly the same time?

• Temporal summation

• Tetanus

• Recruitment

• Size principle

What is the main difference between isotonic and isometric movements?

• Isometric movements involve more motor units than isotonic movements

• Isotonic movements involve more motor units than isometric movements

• Isometric movements change the length of the muscles, while isotonic movements don't

• Isotonic movements change the length of the muscles, while isometric movements don't