Anatomy & Homeostasis. Unit 5
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1 Anatomy & Homeostasis Unit 5
2 Main Ideas discuss with a buddy 2 What is Homeostasis? How is homeostasis different in single-celled organisms vs. multicellular organisms? What unique challenges to maintaining homeostasis do multicellular organisms have to address?
3 Main Ideas answers What is Homeostasis? Animal Organization 3 -maintaining a constant internal balance How is homeostasis different in single-celled organisms vs. multicellular organisms? -Single-celled organisms perform all homeostatic needs (waste removal, energy input, respiration, etc.) within one, single cell. Multicellular organisms must coordinate efforts with cell teams called organs/organ systems specialized for certain jobs. What unique challenges to maintaining homeostasis do multicellular organisms have to address? -Cells in multicellular organsims must differentiate and specialize to cover one homeostatic mechanism for the whole body. Cells must be able to coordinate and communicate to time homeostatic mechanisms properly.
4 4
5 5 Review: Levels of Organization Tissue - Group of similar cells performing a similar function Organ - Group of tissues performing a specialized function Organ System - Collection of several organs functioning together Organism - A collection of organ systems
6 6 Types of Tissues Four Major Types of Tissue 1. Epithelial tissue covers body surfaces and lines body cavities. (skin) 2. Connective tissue binds and supports body parts. (tendons) 3. Muscular tissue causes motion in body parts. (biceps) 4. Nervous tissue responds to stimuli and transmits impulses for communication/control. (brain)
7 7 Epithelial Tissue Epithelial tissue: Forms a continuous layer over body surfaces Lines inner cavities Forms glands -Exocrine glands - Secrete products into ducts or cavities -Endocrine glands - Secrete products directly into the bloodstream Covers abdominal organs
8 Epithelial Tissue Example Animal Organization 8 1.Squamous epithelium is composed of flat cells (e.g., air sac linings of lungs, walls of capillaries).
9 Epithelial Tissue Example Animal Organization 9 2.Cuboidal epithelium has cubeshaped cells.
10 Epithelial Tissue Example Animal Organization 10 Columnar epithelium has elongated cells that resemble pillars or columns (e.g., small intestine). Used for absorption
11 Figure 33.1d Animal Organization 11
12 12 Special Epithelial Tissues 1. Ciliated Epithelia - cells are covered with cilia (e.g., lining of human respiratory tract). Cilia can bend and move material over the surface of the epithelium. 2. Glandular Epithelia - can be unicellular or have multicellular glands. Glands are a single cell or a group of cells that secrete a chemical signal into the body; two types: - Exocrine glands secrete their products into ducts or directly into a tube or cavity. - Endocrine glands secrete their product directly into the bloodstream.
13 13 Connective Tissue Connective tissues consist of: 1. Fibroblast cells 2. A matrix containing collagen and elastic fibers Loose fibrous connective tissue Allows organs to expand Dense fibrous connective tissue Strong connective tissue - Tendons - Ligaments
14 Diagram of Fibrous Connective Tissue 14
15 15 Special Connective Tissue Adipose Tissue Fat cells; stores energy, insulates the body, and provides padding Cartilage Classified according to type of collagen and elastic fibers found in the matrix Cartilage cells (chondrocytes), lie in small chambers (lacunae) in the matrix
16 Figure 33.4 Blood - Actually a connective tissue in which cells are embedded in a liquid matrix (plasma) Red blood cells - erythrocytes White blood cells - leukocytes Transports nutrients and oxygen to cells Removes carbon dioxide and other wastes 17
17 18 Muscular Tissue Contractile cells containing actin and myosin filaments (cytoskeleton fibers made to contract and release) Cells are called muscle fibers Skeletal Muscle - Voluntary - Long, striated fibers Smooth Muscle - Involuntary - No striations Cardiac Muscle - Striated, but mostly involuntary - Bound by intercalated disks
18 20 Nervous Tissue Nervous Tissue contains neurons Made up of dendrites, a cell body, and an axon and used for quick communication -Long axons covered by insulating myelin -Outside the brain and spinal cord, fibers form nerves Neuroglia support and nourish neurons
19 21 Nervous Tissue Nervous system has three functions 1. Sensory input receive stimulus - Sensory receptors detect changes - Transmit info to the spinal cord 2. Data integration make a decision - Spinal cord and brain integrate - Decision is made regarding appropriate response 3. Motor output respond to stimulus - Response is transmitted to effector (gland or muscle) - Effector initiates actual response
20 22 Neurons and Neuroglia Long axons and dendrites form neuron fibers; bound by connective tissue, they form nerves.
21 23 Homeostasis The organ systems of the human body contribute to homeostasis The digestive system -Takes in and digests food -Provides nutrient molecules that replace used nutrients The respiratory system -Adds oxygen to the blood -Removes carbon dioxide
22 24 Homeostasis The organ systems of the human body contribute to homeostasis The liver and the kidneys -Store excess glucose as glycogen -Later, glycogen is broken down to replace the glucose used -The hormone insulin regulates glycogen storage The kidneys -Under hormonal control as they excrete wastes and salts
23 25 Negative Feedback Homeostatic Control Partially controlled by hormones (and) Ultimately controlled by the nervous system Negative Feedback is the primary homeostatic mechanism that keeps a variable close to a set value (e.g. constant temperature) Sensor detects change in environment Regulatory Center activates an effector Effector reverses the change
24 Negative Feedback Mechanisms: Simple 26
25 Negative Feedback Mechanism Analogy: a thermostat 27
26 Same diagram, but now featuring Regulation of Body Temperature 28
27 29
28 30 Positive Feedback During positive feedback, an event increases the likelihood of another event (change is good here) Childbirth Process Urge to urinate Positive Feedback Does not result in equilibrium Does not occur as often as negative feedback
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