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Invertebrates > Lecture 7 > Flashcards

Lecture 7 Flashcards

1
Q

Epidermis

A

Top-skin

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2
Q

Gastrodermis

A

Inner lining membrane of gastrovascular cavity
Layer of cells

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3
Q

Mesoglea

A

Between endo- and ectoderm
Jellylike matrix

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4
Q

Mesenchyme

A

Connective tissue
Undifferentiated cells- give rise to most tissues
Loosely organized embryonic tissue

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5
Q

Polyp

A

Saclike body, tentacles, mouth
CaCO3 exoskeleton

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6
Q

Medusa

A

Only phylum Cnidaria
Bell shaped body, manibrium, mouth

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7
Q

Gastrovascular cavity

A

Food digestion site
Nutrient absorption site

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8
Q

Hydrozoa

A

From phylum Cnidaria
Complex life cycle
Produce gametes on ectodermal
Can be colonial

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9
Q

Anthrozoa

A

A class
Attachers

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10
Q

What do the two embryonic germ layers become?

A

Epidermis
Gastrodermis

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11
Q

What are the two adult morphologies of Cnidaria?

A

Polyp
Medusa

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12
Q

Draw the body plans of hydrozoan poly vs Anthozoan polyp vs hydrozoan Medusa

A
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13
Q

What are the lifestyles of cnidarians? (3)

A

Sessile
Sedentary or
Planktonic

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14
Q

What lifestyles are associated with radial symmetry?

A

Sessile
Sedentary
Planktonic

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15
Q

What is a pro of the ring of tentacles?

A

Can collect food from any direction

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16
Q

Nerve net

A

Simple, decentralized, multipolar nervous system

17
Q

How are the sense organs distributed in cnidarians?

A

Radially

18
Q

What are all the cell types in the Cnidaria body wall? (7)

A

Myoepithelial
-nutritive muscular cells
-epithelio-muscular cells
Sensory cells
Gland cells
Interstitial cells
Cnidocytes

19
Q

Nutritive-muscular cells

A

Secrete digestive enzymes
One of the cell type through which cnidarians move
Cells in the gastrodermis
Range from their tissue layers to the mesoglea

20
Q

Epithelio-muscular cells

A

Epidermis
Produce vesicles containing an adhesive substance- can attach to substrate

21
Q

Describe the basal parts of myoepithelial cells in Cnidaria.

A

Flattened
Interconnected
Contain contractile myofibrils

22
Q

Contractile myofibrils

A

Groups of tendrils
Extend along length of striated muscle fibres

Performs muscle contraction via sliding-filament model

23
Q

🤌Sliding filament model

A

Filaments/muscles overlap
Result in shortening of muscle fibre length

24
Q

🤨Manubrium

A

Tube that connects mouth to stomach
In the subumbrellar cavity

25
Q

What are the two muscle-like cells that allow cnidarians to move?

A

Epitheliomuscular cells
Nutritive-muscular cells

26
Q

Subumbrellar cavity

A

Located beneath the umbrella of a jelly

Invertebrates (3 decks)

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