Lab 8 Flashcards
(45 cards)
What happens to the shape of the earthworm with the circular muscle contract?
It flatens
Why wouldn’t you find a Hydrostatic skeleton in the terrestrial animals that walk or run?
The hydrostatic skeleton is soft and flexible. We would not be able to stand for bones are soft. Therefore, we would not be able to walk or run
Why wouldn’t you find a Hydrostatic skeleton in the terrestrial animals that walk or run?
The hydrostatic skeleton is soft and flexible. We would not be able to stand for bones are soft. Therefore, we would not be able to walk or run
Describe the movement of the earthworm
When the longitudinal muscles contract (bunch) The setae anchor to the ground. When the circular muscles contract (flatten) the setae lift off of the ground. The contraction of the muscles compresses the fluid, raising its pressure and moving the worm forward
Went to stimulate the anterior end of the worm with the toothpick it moves…
Backwards
When you tilt the pan does the worm crawl uphill or downhill?
Uphill
What is true about the exoskeleton of an arthropod?
It’s jointed, composed of chitin, can be molted, and is non living
What is true about the exoskeleton of a mollusk?
It is composed of calcium carbonate and protein, it’s nonliving, and is rigid and lacks joints
At the joints, the exoskeleton of the crayfish is thicker or thinner?
Thinner
Marrow cavity
Cavity in diaphysis
Articular cartilage
A thin layer of cartilage that covers the end
Epiphysis
Enlarged ends
Compact bone
A thin layer that surrounds the bone
Diaphysis
The shaft
Periosteum
A fibrous membrane that covers the bone
Spongy bone
Porous bone found in the ends
Yellow marrow
Fatty substance in marrow cavity
What differences between compact and spongy bone can be seen with the naked eye?
The sponge bonus porous and the compact bone just covers the outside of the bone
What is the advantage of having bones filled with spongy bone as opposed to compact bone?
Spongy bone makes the bones lighter
Which tissue, bone or cartilage, do you think has a more effective system of nutrient delivery and removal of waste products?
Phone has a more effective system because it is more direct and can make blood. Whereas cartilage, has a diffusion process which is lower
Why do fish have many ribs?
They have to be able to swim in a wavelike motion. It is also agile and protects their body
Why can fish carry more muscle living in water than terrestrial vertebrates?
They have a lot of bones which allows them to have more muscle. They are more buoyant which allows them to be heavier
Does a fish have four limbs?
Yes
How do the attachments of the dorsal and caudal fin differ from that of the pelvic and pectoral fin?
The dorsal and caudal fins are fused to the vertebrae, meanwhile the pelvic and pectoral fin are attached to the girdle