Chapter 30: How Animals Move Flashcards
Movement
All living things are able to do this and a major characteristic of life
- most complex in animals
What are the 3 factors that movement is based on?
1) Habitat
2) Complexity
3) Needs
Locomotion
Moving body from one place to another
- requires energy to overcome gravity and friction
What are the advantage/disadvantage of movement by land?
Advantage: Less friction/resistance
Disadvantage: Air gives little support to body –> powerful muscles/strong skeletal support
What are the advantage/disadvantage of movement by water?
Advantage: gravity is not an issue b/c weight is supported by buoyancy
Disadvantage: Lots of friction –> sleek streamline shape, use jet propulsion, specialized legs
What are the advantage/disadvantage of movement by air?
Same as land! But there are wings involved with air foils.
How do air foils in wings work?
The shape of the wing/air foil will alter the air currents to create lift, thus overcoming the downward pull of gravity.
- The pressure will be higher under the wing.
What are the 2 contractile systems that is in every form of cell movement?
1) Microfilaments
2) Microtubules
What is the function of the skeleton?
- Support + framework
- protection
- aid in movement
- maintain shape
What are the 3 types of skeleton?
1) Hydrostatic
2) Exoskeleton
3) Endoskeleton
Hydrostatic (Skeleton)
Fluid is held under pressure in a closed body compartment.
- protects other body parts (cushioning from shock)
- gives body shape and provides support for muscle action
- ex. earthworms, cnidarians, jellies
Exoskeleton
Rigid, non living external skeleton
- great protection and support
- limited movement due to molting, making it vulnerable
- ex. arthropods, mollusks
Endoskeleton
Hard skeleton located w/in soft tissues
- offers movement, flexibility, growth
- limited protection
- ex. sponges, echinoderms, vertebrates
What are bones mainly comprised of?
Calcium w/ phosphate or carbonate
- gives bones frigidity and strength
What are the two hormones that regulate the exchange of materials in the bone?
Calcitonin and parathymon
- growth hormone + sex hormones for bone growth
Joint
Region b/w 2+ bones that provides for flexibility and versatility of bones
- synarthroses, amphiarthroses, diarthroses
Synarthroses (joints)
Immovable joins
- ex. plates of cranium
Amphiarthroses (joints)
Slightly moveable joints
- ex. vertebrae of spine
Diarthroses (joints)
Freely moveable joints
- ex. hinges (elbows/knees), balls and sockets (shoulders/hips), pivot (wrist/ankle)
Arthritis
“Joint swelling” w/ inflammation that causes stiffness and soreness
Osteoporosis
Bones that get thinner, more porous
- hormonal changes due to eating
How many bones are there in the average human body?
206 bones
- 100+ in the hand/feet alone
- 18% of body weight
What are the two major divisions of the skeletal system?
1) Axial Skeleton
2) Trunk Skeleton
Axial Skeleton
Components of the skeletal system that supports the central trunk of the body
- Skull (cranium, facial bones, ossicles, mandible)
- Trunk (vertebral column: cervical, thoracic, lumbar, sacral, coccyx
- Sternum
- Costae (true ribs/false ribs)