Animal Development continued. By the fly hunnys. Key Concepts. Morphogenesis in animals involves specific changes in cell shape, position and adhesion The developmental fate of cells depends on their history and on inductive signals. Morphogenesis.By keisha
Fate of Cells. The developing embryo undergoes morphogenesis in order to create different tissues and organs through cleavage, gastrulation, and organogenesis Morphogenesis… changing of form, shape, or function Cleavage… pinching off to form 2 structures or a division within a structureBy gari
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Chemical Signals. Types Production Transmission Reception. Olfactory signal features. Directionality Generally propagate away, but rarely linear Transmission speed Depends on diffusion rates, wind speeds Temporal pattern Difficult to turn on and off Spectrum Multi-dimensional.
Chemical Signals 2. BIOL 1407. Endocrine Glands. Hormone-secreting cells make up endocrine system Ductless glands Secrete into blood Receptors on target cells. Hypothalamus-Pituitary Axis. Hormones Released from Posterior Pituitary. Relationship of Hypothalamus and Anterior Pituitary.
Chemical Signals 1. BIOL 1407. Chemical Signals. Cells use chemicals to communicate with other cells http://www.livevideo.com/video/9DF33CE7B1014B55BEF2322395D72133/neutrophil-chemotaxis.aspx Photo Credit of Neutrophil engulfing anthrax bacteria: Tim Vickers, 2007, Wikimedia Commons.
Neuroinduction. Diffusible morphogen. Ligand. Receptor. Kinase Cascade. A. C. B. Effector Proteins ( transcription factors , ion channels, cytoskeletal proteins, enzymes, etc…). Scaffolding Proteins bind multiple signaling molecules to organize specific signaling pathways.
Diffusible morphogen. Neuroinduction. Ant. Post. Endoderm and Mesoderm involute with gastrulation: Induction of the Neural Plate from Neuroectoderm, by the underlying , closely apposed Mesoderm. Hilde Mangold and Hans Spemann. Key experiments performed in 1921-1923 at the
Electrical and Chemical Signals. Aim: Does the colour intensity of a drink affect how sweet it tastes?. Any Questions?. Method:. Collect cups, lemonade (of a known sucrose concentration), red food dye, stirring rod and a measuring cylinder.
Chemical Signals in Animals. Learning Objectives (3/2/09). Differentiate between types of cellular chemical messages: autocrine, paracrine, and neuroendocrine Compare the response time & duration for the two major systems of internal communication in animals: nervous and endocrine
Chemical Signals in Animals. Chemical Signals in Animals. A hormone is a chemical secreted into the blood (or other body fluids) that communicates a regulatory message Secreted by endocrine glands (“ductless glands”) May affect whole body or only target cells
Chemical Signals in Animals. Chapter 45. 2 communication systems in body. 1 Nervous system, 2 endocrine system. Endocrine system - glands and tissues that secrete hormones, chemical messengers produced by cells to act on other cells.
Chemical signals in Animals. Ch 45 – Endocrine system. Human Endocrine system. Both the nervous system & the endocrine system send message to the body Nervous – messages for quicker, more specific responses Endocrine – messages for broader, more widespread responses