Introduction ANAT AND PYHS

Introduction ANAT AND PYHS - • Absorption – movement of...

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Introduction
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What Is Life? Characteristics associated with life Highly organized Atom- add two together and it makes… Molecules- ex: water H2O Organelles : things working inside cell, golgi apparatus, mitochondria Cells Smallest structure capable of performing all characteristics of life Tissues – cells alike in structure and function Organs – groups of tissues working together Organ-systems: circulatory system, heart and blood. Human body: Ex. Populations- communties- ecosystems, biosphere.
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Characteristics continued Sense and respond to the environment Capacity to grow- increase number of cells, increased in size. Develop- differentiation- generized cell to specialized cell, morphogenesis- making organs, shapes of tissues, changing from cell to organ systems. Reproduce Movement Metabolism- energy source
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Characteristics continued Respiration – process of obtaining oxygen Digestion – changing large food substances into smaller
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Unformatted text preview: • Absorption – movement of molecules across a membrane • Circulation – transport of substances throughout body. Ex. heart, arteries, capillaries, veins. • Excretion – removal of waste products Homeostasis Three components Figure 1.4 RECEPTOR (e.g., free nerve ending in the skin) sensor INTEGRATOR (such as the brain) EFFECTOR (a muscle or a gland) Stimulus Response Two types of Feedback • Negative feedback – Some activity alters a condition in the internal environment – Alteration triggers a response – Response reverses the altered condition – Examples: • Changes in hormones such as insulin • Response to increased body heat Positive Feedback • Some activity alters the internal environment • The alteration triggers a response • The response intensifies the change in the internal condition • Figure 1.5 • Continues on till reaches a conclusion – Examples • Blood clotting • Child birth...
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This note was uploaded on 09/14/2011 for the course BIO 227 taught by Professor Lonsdale during the Fall '10 term at Boise State.

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Introduction ANAT AND PYHS - • Absorption – movement of...

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