Download 25.1. Typical Animal Characteristics

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Ch 25 What Is An Animal
25.1. Typical Animal Characteristics
A. Characteristics of Animals – Eukaryotic, multicellular, _________________, heterotrophic organisms
1. Methods for obtaining food vary – mobile animals have the ability to seek found whereas sessile
animals rely on food coming to them (ex: water brings food to barnacles)
a. _________________ – organisms that don’t move from place to place
2. Animals must digest food - animals are _________________ and must digest food. Most animals
have a _________and ___________, some only have __________body opening.
3. Animal cell adaptations – animals have specialized _______________to carry out metabolic functions
B. Development of Animals – most animals develop from a single, fertilized egg called a zygote.
1. _________________ –occurs when
sperm fertilizes an egg. It may be
internal or external
2. Cell division – zygote divides by mitosis
a. _________________ – a hollow ball of cells
3. Gastrulation - blastula folds inward
a. _________________ – a structure
made of two layer of cells with an
opening at one end
b. _________________ - the layer of
cells on the outer surface of the gastrula
c. _________________ – the layer of
cells lining the inner surface
4. Formation of the mesoderm – found in the middle layer
of the embryo
a. _________________ - the third cell layer found in the
developing embryo between the ectoderm and the endoderm
b. protostome - an animal with a _________ that develops
from the opening in the gastrula (ex: earthworms/insects)
c. _________________ – an animal in which the mouth
develops from cells elsewhere on the blastula (ex: fish,
birds and humans)
5. Continued growth and development – In some animals, the _________________ develops into a
_________________ which is different from the adult version. (ex: echinoderms and insects)
6. Forming an adult animal – eventually, all juveniles reach sexual maturity and the life cycle can repeat
25.2. Body Plans and Adaptations
A. What is Symmetry?
a. _________________ – a balance in proportions of an object or
1. _________________ in a sponge – an animal with an irregular
shaped body (ex: sponge)
2. Radial symmetry in a hydra
a. _________________ _________________ – can be divided
along any plane through a central axis into roughly equal halfs
3. Bilateral symmetry – ex: any organism with a head
a. _________________ _________________ – can be divided
down its length into similar right and left halves that form mirror images.
d. ______________
– back surface
b. _________________ – head
c. ____________
– tail end
e. _________________ –
belly surface
B. Bilateral Symmetry and Body Plans
1. Acoelomate flatworms have no body cavities – “A” = without, “coelom” = body cavity
a. _________________ – 3 cell layers – ectoderm, endoderm, mesoderm - but no body cavity
2. Pseudocoelomates have a body cavity – “pseudo” = false. Body cavity develops between the
endoderm and the mesoderm
a. _________________ – a fluid-filled body cavity partly lined with mesoderm
3. The coelom provides space for internal organs
a. _________________ – a fluid-filled space that is completely surrounded by mesoderm
C. Animal Protection and Support
a. _________________ – a hard, waxy covering on the outside of the body that provides a framework
for support
b. _________________ – an internal skeleton that provides support inside an animal’s body
c. _________________ – an animal that does not have a backbone
d. _________________ – an animal with a backbone
Document related concepts

List of types of proteins wikipedia, lookup

Organ-on-a-chip wikipedia, lookup