Muscles and Muscle Physiology

What do muscles need in order to transmit force?

• A rigid skeleton

• Function as a strut

• Similar muscle organisation

• An appropriate environment

Muscles exert force while shortening

• True

• False

Tags

NGSS.MS-PS2-1

What unit is work measured in?

• Newtons (N)

• Watts (W)

• Joules (J) or Millijoules (mJ)

• Joules per second (J/s)

In nearly all muscles, the muscle cells are long relative to their diameter.

• True

• False

Actin filaments have a heavy chain and two light chains

• True

• False

The force that muscles can generate per unit area of activated fibres is quite uniform.

• True

• False

The force-length relationship suggests that muscle fibres are designed to operate at...

• A resting length

• A maximum sarcomere length

• An intermediate sarcomere length

• A minimum sarcomere length

The amount of power a muscle can produce per unit mass is independent of sarcomere length

• True

• False

What happens during a jump landing?

• Active muscle shortening

• Active muscle lengthening

Excessive muscle stretch may be a contributor to injury

• True

• False