Ch.5+6

Question 1

Definition of the word Skeleton

Answer 1

A solid or fluid system permitting muscles to be stretched back to their original length following a contraction. Such a system may or may not have protective and supportive functions as well

Question 2

What activities are muscles capable of?

Answer 2

The can shorten and relax but can’t actively extend themselves

Question 3

Antagonize

Answer 3

Triceps and biceps taking turn stretching each other back to pre contraction length ( happen with other muscles in your body too)

Question 4

What are the basic requirements of a hydrostatic skeleton

Answer 4

1. the presence of a cavity housing an incompressible fluid that changes uniformly in all directions
2. that this cavity is surrounded by a flexible outer body membrane, so that the outer body was can be deformed
3. that the volume of fluid in the cavity remains constant
4. that the animal be capable of forming temporary attachments to the substrate, if progressive locomotion is to occur on or within a substrate
5. the presence of a deformable but leastic covering or the presence of at least two sets of muscles that can act against each other

Question 6

Defining characteristics of Cnidarians

Answer 6

1) secretions of complex intracrllilar organelles called cnidae (nematocytst)
2) planula larvae in the life cycle

Question 7

What are the two different body plans found among cnidarians?

Answer 7

1. Medusa = also referred to as jellyfish and resembles a gelatinous saucer or upside-down cup with tentacles and generally swims
2. Polyp = has a tubular body and is generally stationary

Question 8

What is the role of the amoebocytes in the mesoglea?

Answer 8

May play roles in digestion, nutrient transport and storage, wound repair and antibacterial defense

Question 9

What are some functions of Cnidae

Answer 9

Function in food collection, Defense and to some extent locomotion

Question 10

Defining characteristics of Scyphozoa

Answer 10

Asexual replication via strobilation