Skeletons and Muscles TEST

Which of these animals has a skeleton without hard parts?

• whale

• lobster

• jellyfish

• goldfish

What happens to an arthropod during molting?

• It sheds its exoskelton

• It grows a new appendage

• It replaces a cartilage with bone

• It contracts its muscles

Which of the following happens at a joint?

• Muscle cells grow

• A new exoskeleton is formed

• Spikelike structures are made in cells

• Two parts of a skeleton meet

What factor makes it possible for animals with endoskeletons to grow larger than animals with exoskeletons?

• Endoskeletons can be removed and replaced

• Endoskeletons are lighter than exoskeletons

• Endoskeletons are made of fluid-filled tubes

• Endoskeletons lack joints that can break down

Some ________ are parts of an organ

• muscles

• ribs

• tissues

• cartilages

When a muscle relaxes, it becomes shorter

• True

• False

Cartilage is ______ flexible than bone

• less

• more

During _________ arthropods shed their skeletons in order to grow

• molting

• growing

• contracting

• metamorphosis

_________ have spikelike structures among their cells instead of skeletons

• Mollusks

• Sponges

• Cnidarians

• Arthropods

A jellyfish skeleton is made up of fluid-filled cavities surrounded by _______

• air

• muscle

• joint

• organ