BL7.1
Terms
undefined, object
copy deck
- Dorsal
- describing the back portion of structure
- Ventral
- describing the lower surface of a structure
- Medial
- describing the mid region of an organism
- Lateral
- the sides, right and left
- Anterior
- the head end, or the part, which moves forward
- Posterior
- the tail end of the animal
- Distal
- away from the main mass of the body
- Example of Distal
- fingers
- Proximal
- near the main mass of the body
- Example of proximal
-
shoulder
thigh - Peripheral
- on or near the surface?
- Superifical
- on or near the surface
- Central
- toward the middle fo the body
- Oral
- the surface on n which the mouth is located
- Aboral
- the surface opposite from that containing the mouth
- Cranial
- towards the head
- Caudal
- towards the tail
- Anteroposterior/longitudinal axis
- a line extending from the head to the tail (not necessarily dividing the body in half)
- Dorsivental axis
- a line running across the body from teh dorsal to the ventral side
- Transverse axis
- a line running across the body from side to side
- Sagittal/median plane
- the plane is vertical and passes through the exact mid-line of the body (it includes both anteroposterior and dorisiverntral axes)
- Transverse plane
- any cross section throught the body (includes transverse and dosiventral axes)
- Frontal plane
- any plane (includes trasverse and anteroposterior axes)
- Name 4 characteristics of Cnidaria
-
1) Multiceullar
2) Radially symmetric
3) Lack organs
4) Prossess true tissue - What is the 2 body plans of Cnidarians
-
1) polyp
2) medusa - Name 2 functions of tentacles
-
1) Capture food
2) Protect the organism suurounds the mouth - Name 2 functions of gastrovascular cavity
-
-Preliminary phases of digestion
-food distribution - Gastrodermis
- Epithelial tissue that lines the gastrovascular cavity
- Hwo many cellular layers do cnidarians have?
-
1) an outer epidermis
2) An inner gastrodermis - What is the outer epidermis derived from?
- Ectoderm
- What is the innner gastrodermis derived from?
- Endoderm
- What is the name of the space between epidermis and gastrodermis?
- Mesoglea
- True/False: The mesoglea is a true cellular layer
- False
- Function of cnidocyte
- Produce specialized stining organelles: nematocytes
- 2 Functions of nematocystes.
-
1) Eject small harpoon-like projections (usually is poison)
2) Attach to substratum to aid in locomotion - Name the digestion system in cnidocytes
- Gastrovascular cavity
- Name the central nervous system in cnidocytes
- True/False: Testis and ovary in Cnidocytes do not consider as organ
- True
- How is hydra different from most cnidarians?
- It doesn't have a medusa stage
- Why is there bud on the hydra?
- It is a form of asexual reproduction
- Dioecious
- Male and female reproductive parts are found in separate individuals
- Hermaphroditic
- Both male and female parts are found the same individual