Chapter C4. I sistemi scheletrico e muscolare #108770

Vertebrate skeletal muscles

To increase the force of muscle contraction,

A:

individual muscle fibers must contract with greater force.

B:

motor units must contract with greater force.

C:

more motor units need to be recruited.

D:

All of these are correct.

E:

None of these are correct.

Scelta multipla

Mammalian skeleton

This bone is the only movable bone of the skull:

A:

sphenoid.

B:

frontal.

C:

mandible.

D:

maxilla.

E:

temporal.

Scelta multipla

Vertebrate skeletal muscles

Which of the following is not a function of the muscular system?

A:

hormone production

B:

heat production

C:

movement

D:

protection of internal organs

E:

All of these choices are functions of the muscular system.

Scelta multipla

Skeleton

Unlike an exoskeleton, an endoskeleton

A:

grows with the animal.

B:

is composed of chitin.

C:

is jointed.

D:

protects internal organs.

Scelta multipla

Skeletal system

Which of the following is not a function of the skeletal system?

A:

production of blood cells

B:

storage of minerals

C:

movement

D:

storage of fat

E:

production of body heat

Scelta multipla

Mammalian skeleton

Spongy bone

A:

contains osteons.

B:

contains red bone marrow, where blood cells form.

C:

lends no strength to bones.

D:

contributes to homeostasis.

E:

fills the medullary cavity.

Scelta multipla

Skeleton

All blood cells — red, white, and platelets — are produced by which of the following?

A:

yellow bone marrow

B:

red bone marrow

C:

periosteum

D:

medullary cavity

Scelta multipla

Mammalian skeleton

A component of the appendicular skeleton is the

A:

rib cage.

B:

femur.

C:

skull.

D:

vertebral column.

Scelta multipla

Vertebrate skeletal muscles

A neuromuscular junction occurs between an axon terminal and a

A:

muscle fiber.

B:

myofibril.

C:

myosin filament.

D:

sarcomere only.

Scelta multipla

Vertebrate skeletal muscles

Which of these is the direct source of energy for muscle fiber contraction?

A:

ATP

B:

creatine phsosphate

C:

lactic acid

D:

glycogen

Scelta multipla