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Porifera+Cnidaria+Platyhelminthes+Annelida Test Review
Terms in this set (21)
The amoeboid cells are responsible for producing gametes.
In sponges, what cells are responsible for producing gametes (sex cells)?
The flatworms do not have coeloms, ribbon like worms, and they're parasitic.
What characteristics define the Platyhelminthes phylum?
A jellyfish has both a polyp and a medusa
What representative invertebrate has two different body plans - a polyp and a medusa?
The ganglia is the simple brain that both flatworms and roundworms.
In both flatworms and roundworms what word is used to describe their simple brain?
The pharynx secretes the digestive enzymes onto food and partially digests the food and is sucked into a tube and digests
How do planarians obtain their food?
The setae are the bristles that grip the surface.
In earthworms, what is the function of setae?
The earthworm's squeeze their circular muscles grip the surface with their bristles then their body is pulled up to their anterior.
In earthworms, what muscles are involved in movement?
They all have segments and bilateral symmetry, which determines the annelidas.
What key characteristic defines animals in the Annelida phylum?
Nitrogen and poop are removed by the 2 nephridia in every segment. They remove the nitrogen with waste from the blood capillaries through the tiny pores.
The earthworms have ganglions, which is a swollen region of nerves, and receive messages from the segment it is located in. The cerebral ganglion acts as the brain in segment 3 since earthworms have no eyes, ears, or nose. The worms can detect light and darkness by small light sensitive cells mostly found on the upper skin surface. The worms can sense vibrations and dangerous chemicals by those touch or chemical sensitive cells. The worms will move away from light and dangerous chemicals.
The pharynx is used to suck food and soil into the worm's mouth.
In earthworm digestion, what is the function of the pharynx?
All earthworms feed on organic matter in the soil and plants. The worm then uses its pharynx to suck food or soil into its mouth. The crop temporarily stores the food while the gizzard is a horny line, which helps grind up food into smaller particles.
The clitellum is responsible for producing the mucous.
In earthworm reproduction, what structure is responsible for producing a mucous membrane
The blood then will carry the oxygen all over the worm's body.
As part of an earthworm's circulatory system, when oxygen diffuses across the skin it goes into capillaries. Where does it go from there?
Everything was anterior to the clitellum.
In the earthworm Dissection lab, where did most of your internal observations take place with respect to the location of the clitellum?
Earthworms do not need to fertilize themselves while reproducing. The worms lie side by side and wait until mucus from their clitellums hold the worms together. The sperm will then travel from segment 15 to the clitellum, which is on segment 9 or 10 on the worm they're mating with. After that, the worm will lay cocoons from the clitellum and withers away from the cocoon as the worm releases 8-16 eggs from the seminal receptacles. (Segment 14)
The crop stores the food and the gizzard helps grind the food into small particles.
In earthworm digestion, what is the function of the crop? Function of the gizzard?
The nephridia gets rid of nitrogen and waste.
In earthworms, what is the function of nephridia?
The earthworm's brain is the cerebral ganglion.
In earthworms what is the primitive brain called?
The earthworm's blood is pumped around the body by the 5 aortic arches. The blood first starts to travel from the dorsal blood vessel to the arches and the arches allow the blood to flow to the ventral blood vessel.
The earthworm breathes from the moisture skin of the worm. The oxygen from the air goes in the moisture on the worm's skin then travels into the skin's blood capillaries. The blood then carries the oxygen all over the worm's body. Carbon dioxide is lost from the body.
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