Presentation on theme: "How Do Organisms Respond to Change?"— Presentation transcript:
1How Do Organisms Respond to Change? Animal Physiology:How Do OrganismsRespond to Change?
2What Are The Underlying Principles of Physiology? Cells of multicellular organisms are hierarchically arrangedMulticellular organisms are more than the sum of their partsMulticellular organisms function best within stable internal environmentsFeedback systems control many physiological processes
3Cells of Multicellular Organisms are Hierarchically Organized Multicellular organisms have cells that are organized into tissuesGroups of similar cells performing a similar function
4Four Types of Tissues Epithelial Covers surfaces throughout the body ( inside and out) and protect what they cover.Three types based on cell shape: Columnar, Cuboidial, Squamous.
5Four Types of Tissues Connective Usually composed of living cells surrounded by nonliving matrices.Found throughout the body.Various Functions
6Four Types of Tissues Muscle Highly contractile Major function: move internal parts, or along with bones to move body as a whole.Three types:StriatedSmoothCardiac
7Four Types of Tissues Nerve tissue Abundant throughout the body Primary function is to relay information from the external and internal environments to the brain.Process that other information , and relay messages from the brain to all internal body parts.
8OrgansComplex systems of tissue that work together to perform common functions.Examples:StomachSkinForearm
9Organs are Organized into Organ Systems Organ Systems: A group of organs that work together to perform a specific function.
11Multicellular Organisms are More Than The Sum of Their Parts They are synergismsAn instance of the combined effect of several actions being greater than the sum of the individual actions.
12Multicellular Organisms Function Best Within Stable Environments HomeostasisMaintaining a constant internal environmentMulticellular organisms function best under nearly steady-state internal conditions.
13Feedback Systems Control Many Physiological Processes Regulation of a process by which a component from a later stage in the process controls its own production by influencing an earlier stage in the process.2 typesPositive and Negative
15Additional Points to Remember: All physiological processes are a cellular phenomenaExample: Digestion of nutrients in intestine and their movement through the bloodThere is a relationship between form and functionExample: structure of cell is related to its function
16Additional Points to Remember: Tolerable ranges of internal and external conditions often vary from one organism to the next.Example: algae living in near boiling hot springs
17Additional Points to Remember: Evolution often results in increasing complexity, but not always.Example: the digestive systems of various animalsPlants are structurally and physiologically less complex than plants.Example: most advanced plants produce flowers which consists of only three organ systems.
18How Do Organisms Obtain Information From Their Environment? Organisms need to assess:What is the current state of the environment?What changes are taking place?What adjustments need to be made to adapt to these changes?Two systems devoted to answering these questions:Endocrine and Nervous systems
19Endocrine Systems Most primitive environmental monitoring system Based on the presence of absence of chemicalsThese systems produce hormonesChemical messages
20Endocrine SystemsHormones are respond to long-term changes in an organism’s environments.Key in such processes as growth, maturity, preproduction and metabolism.
21Nervous SystemsAllows for quick adjustment to environmental conditions that may be necessary for survival.Found only in animalsBasic cellular unit in vertebrates is neurons.Allows the brain to be connected with all parts of the body.This system evolved from rather simple networks into highly complex systems .composed of numerous lateral nerves that feed information into and out of highly complex, centralized nerve cords and brains.
23How Do Organisms Acquire and Process Nutrients and Wastes? We are all dependent on our surroundings.Ultimately dependent on the sunEach of these systems depend on diffusion and osmosis to move nutrients and water between cells, tissues, and organs systems.
24Primitive Organisms Process Nutrients and Wastes Bacteria and fungi digest their food outside the cellsThey obtain nutrients by excreting enzymes onto their food.The enzymes break down complex compounds into simpler ones.
25Multicellular Organisms Have Digestive Systems Among animals, digestive systems (absent in sponges) evolved from those withSingle openingsExample: jellyfish and flatwormsInto simple, undifferentiated tubes with two openingsExample: RoundwormsTo complex, convoluted tubes with accessory organsExample: other animals such as humans
28Animals Use Respiration to Obtain the Gases They Need Three basic types of systems:Skin-the outer body coveringGillsOutpockets of tissue that work best in waterLungsInpockets of tissue that work best in airShare two characteristics:Extensive surface area and thin, moist cell layers to facilitate diffusion
29Animals Use Respiration to Obtain the Gases They Need Simple organisms such as hydra and flatworms exchange gases via their skin.
30Animals Use Respiration to Obtain the Gases They Need Insects have a system of internal tubes that open to the outside thought spiracles and connect to internal air sacs.
31Animals Use Respiration to Obtain the Gases They Need Bony fish bring water with oxygen into mouth and it passes over gills where gaseous exchange occurs.
32Animals Use Respiration to Obtain the Gases They Need Mammals use muscles to pump air containing oxygen into the lungs where gaseous exchange occurs.Structure of lungs increases the surface area.