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Flashcards in Embryonic Development Part II Deck (65)
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1

What does the development of a digestive tract enable?

specialization of gut regions

2

what does the stomach do?

it stores food until it can be readily processed
- disinfects food

3

what does the intestine do?

breaks down the food

4

What does the development of a digestive tract enable?

Sequential food processing

5

What does the development of a digestive tract enable?

continuous operation

6

What's the gizzard?

muscular structure that grinds food particles

7

How do cows eat their food?

they regurgitate their food and chew it some more and make it more processable and then food gets swallowed again and is in the omasum

8

what does the omasum do?

takes in a lot of water and minerals from the food

9

what odes the abomasum do?

disinefcts the food with hydrochloric acid - like our stomach

10

what does the intestine of a cow do?

secretes enzymes and process all of the molecules

11

what's the digestive system of a rabbit?

rabbit eats the food --> stomach --> small intenstine but not much can happen here since the cellulose is in the way --> large intestine: water extraction --> cecum: corresponds to our appendix - lots of microorganisms: break down of cellulose --> gut --> produces two types of poop

12

what are the two types of poop rabbits produce?

1. soft poop with the goodies and then they eat it...
2. poop with all the waste

13

What are the two ways a digestive tract develops in bilateria?

Protosomes
-1st is mouth
-blastopore --> mouth
-new opening --> anus

14

What are the two ways a digestive tract develops in bilateria?

Dueterostomes
-humans
-2nd is mouth
-blastopore --> anus
-new opening --> mouth

15

What are the tree different body plans with respect to body cavities?

1. coelomate
2. pseduocoelomate
3. acoelomate

16

Coelomate

mesoderm lines the entire cavity as a "peritoneum"

17

Pseudocoelomate

"false colem"
- the mesoderm lines the outside of psedocoel

18

Acoelomate

- no body cavity
- solid except digestive space
- flat organisms (not much in terms of organs)

19

What the two ways to make a coelom

1. schinzocoely
2. enterocoely

20

schinzocoely

splitting with the mesoderm
- protosomes

21

enterocoely

mesoderm forms pockets from the gut
-deuterostomes

22

LOPHOphore

ciliated feeding gas exchange strucutre

23

TROCHOphore

a ciliated free living larval form

24

what kind of animals are Endysozoans

moulting animals

25

how do animals moult?

they have an external covering secreted by the epidermis that must be shed in order to grow

26

when are endysozoans vulnerable?

directly after moulting

27

when did moulting evolve?

more than 500 million years ago

28

how does moulting work?

-they inflate and are soft
-then they harden and replace air space inside the body (grow mass but don't grow in size)
-adults stop moulting and stop growing

29

are worms a monophyletic group?

nope

30

Nematoda are also known as

roundworms