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PCS Liv Env

Vocabulary for Topic 2 - Homeostasis in Organisms

AIDS disease that results when the HIV virus attacks the human immune system
Allergy person's immune system is overly sensitive to environmental substances that are normally harmless
Antibodies a protein, produced by the immune system, that either attacks invading pathogens or marks them for killing
Antigens a molecule found on the outer surfaces of cells that the immune system recognizes as either part of the body or an outside invader
ATP stores energy in cells
Bacteria single-celled organisms without a distinct nucleus
Biochemical Process a chemical process that occurs in a living thing
Catalyst a substance that can speed up the rate of a chemical reaction without being changed or used up
Cellular Respiration process in which nutrients are broken apart, releases chemical energy
Chloroplast green organelle that contains chlorophyll; where photosynthesis occurs
Disease condition, other than injury, that prevents the body from working as it should
Dynamic Equilibrium the constant small corrections that normally occur to keep an organism's internal environment with the limits needed for survival
Enzyme proteins that speed up the rate of chemical reactions in living things
Feedback Mechanism a cycle in which the output of a system either modifies or reinforces the first action taken by the system
Fungi the kingdom of organisms that are mostly multicellular, have cell walls made of chitin, and are heterotrophic
Gas Exchange the process of obtaining oxygen from the environment and releasing carbon dioxide
Glucose a sugar that is a major source of energy for cells
Guard Cells specialized cells that control the opening and closing of the pores on the surface of a leaf
Homeostasis the ability of an organism to maintain a stable internal environment even when the external environment changes
Immune System the body's primary defense against disease-causing pathogens
Insulin a hormone that prompts glucose to move from the blood into body cells, resulting in a lower glucose level in the blood
Microbe any microscopic organism
Mitochondria pod-shaped organelles that contain enzymes used to extract energy from nutrients
Pancreas an endocrine organ that secretes insulin
Parasite an organism that survives by living and feeding on other organisms
Pathogen an organism that invade the body, causing disease
pH a measure of whether a substance is acidic, neutral, or basic
Photosynthesis the process by which some organisms are able to capture light energy and use it to make food from carbon dioxide and water
Respiration the process by which the chemical bond energy stored in nutrients is released for use in cells
Stimuli any change in the environment that causes an organism to react
Synthesis a life process that involves combining simple substances into more complex substances
Vaccine a substance made of weakened, killed, or partial pathogens and designed to protect the body from future invasions of that pathogen
Virus a nonliving particle of protein and genetic material that reproduces by invading the cell of a living organism
Created by: Ms.Sala