Cells Chapter 8

Pretest Which cells surround and consume harmful organisms that invade the body? A. antibodies B. phagocytes C. epithelial cells D. Hormones Which system carries oxygen in the body? A. endocrine system B. skeletal system C. circulatory system D. nervous system

____________ is a gel-like material that surrounds the internal parts of a cell. A. chloroplast B. nucleus C. cytoplasm D. Mitochondria The system that fights disease and other foreign agents. A. circulatory B. immune C. endocrine D. urinary

Mucus, skin, tears, saliva, and ____________ are all part of your first line of defense. A. earwax B. eyeball C. finger nail D. tongue __________ are chemical message made by endocrine glands. A. hormones B. cells C. tissues D. glucose

What do cells do? Chapter 8 Lesson 1

Big Idea: All living things are made of cells. To stay alive and healthy, cells need food, water, and a way to eliminate waste.

A single cell is the smallest structure that carries out the activities necessary for life. *Animals and plant cells have 3 features in common: cell membrane nucleus cytoplasm

cell membrane: outer covering of the cell; water & food enter through it; wastes move out of the membrane nucleus: part of cell that directs all cell activities & carries info for cell reproduction cytoplasm: gel-like material that spreads around the internal parts of the cell Organelle: structure that has a specific task within the cell *for example: mitochondria (energy), vacuoles (stores materials), golgi bodies (transports), endoplasmic reticulum

structure and transport Nucleus cell control center; reproduction Cell Membrane structure and transport

Only plant cells have cell walls and chloroplasts. cell walls: adds support to a plant cell chloroplast: organelle that makes food from sunlight, water & carbon dioxide

Cell membranes use both passive & active transport. Cell Transportation A cell membrane allows water, gases, and wastes to pass in and out of the cell. Cell membranes use both passive & active transport. passive transport no energy needed active transport requires energy

Active transport requires energy & goes from LOWER to HIGHER. Diffusion: process that spreads substances through a gas or liquid from a HIGHER to a LOWER concentration passive transport Active transport requires energy & goes from LOWER to HIGHER. Special Type of Diffusion: Osmosis: a type of diffusion that allows water to pass, but not the solutes in the water; keeps water inside the cells

Using Energy Photosynthesis: process that plants use to make food by using the energy of sunlight Photosynthesis takes place in the ___________ and depends on a green pigment called chlorophyll. Sugar that plants produce in photosynthesis is called _________. Mitochondria breaks down these sugars into energy. The energy is stored in an ATP molecule. chloroplasts glucose

Your body is made up of trillions of cells. Did you know? Your body is made up of trillions of cells. Yet you began as just a single cell! How did you grow? Cell division

How are cells specialized? Chapter 8 Lesson 2

Main Idea: Complex organisms have many types of cells. Each cell has special structures that allow it to carry out specific tasks.

Different Cells for Different Jobs Tissues: group of cells that has a common structure and function Organs: 2 or more types of tissues that work together Example: brain, heart, kidneys Organ systems: group of organs that work together to perform complex tasks

Organ Systems The more complex the organism, the greater the number of organ systems it needs to survive. Humans have 11 organ systems. Each system plays a particular role in the body. Systems influence each other. Some organs work for more than one system.

Musculoskeletal System Nervous System Endocrine System ORGAN SYSTEM FUNCTION Circulatory System carries oxygen and removes CO2 via blood Musculoskeletal System supports body and allows you to move Nervous System controls movements and other organ systems; brain-controlled Endocrine System works like a chemical communication system; has glands that produces hormones Respiratory System exchanges oxygen and CO2 between the organism and the environment (breathing) Hormone: chemical message that travels through the blood and carries special info. Humans have about 50 hormones. They do things such as regulate growth and energy use, control blood sugar, and cause specific body changes

Musculoskeletal System Organ Systems (7 of the 11 systems) Circulatory System Digestive System Endocrine System Musculoskeletal System Nervous System Respiratory System Urinary System

Organization of Living Things cells tissues organs organ systems organisms

How does disease affect cells? Chapter 8 Lesson 3

infectious disease: contagious; disease caused by organisms or viruses noninfectious disease: disease caused by malfunction of an organ system immune system: organ system that fights disease & foreign agents

Includes ways your body stops disease agents from entering the body 1st line of defense Includes ways your body stops disease agents from entering the body Examples: skin, tears, saliva, ear wax, mucus 2nd line of defense Starts if harmful agents enter your body inflammation: blood reacts to fight infection phagocytes: cells surround & consume harmful disease agents

Immune System - this system fights harmful agents of disease 3rd Line of Defense Immune System - this system fights harmful agents of disease *produces antibodies to fight invading agents

A vaccination puts a small amount of a live or dead virus into the body. The vaccine causes the immune system to develop antibodies.

The Human Body’s Defenses Against Disease In summary, The Human Body’s Defenses Against Disease tears, saliva, mucus, skin, ear wax inflammation phagocytes immune system

Let’s see what you have learned! Diffusion is ________ transport that allows water to pass through the membrane from an area of _______ to ____ concentration. We start as a single cell. We grow as a result of ________________. ____________ is a gel-like material that surrounds the internal parts of a cell. passive high low cell division Cytoplasm

A sugar that plants produce through photosynthesis is _______________. ______________ are cells that surround and consume harmful organisms that invade the body. The _____________ system carries blood (which contains oxygen) to all parts of the body. The __________ system fights disease. _____________ are chemical message made by endocrine glands. (hint: efgh) glucose Phagocytes circulatory immune Hormones

word bank: musculoskeletal endocrine circulatory nervous ORGAN SYSTEMS brain is the center; controls other parts of the body carries blood & oxygen all over the body circulatory system nervous system has glands that produces chemical messages called hormones supports the body and allows for movement musculoskeletal system endocrine system word bank: musculoskeletal endocrine circulatory nervous

3 things cells have in common: cell membrane, nucleus, cytoplasm Study Guide 3 things cells have in common: cell membrane, nucleus, cytoplasm 2 things plants cells have that animal cells don’t: cell wall, chloroplasts organ systems 1st, 2nd, 3rd defense systems Vocabulary diffusion glucose cell division hormones phagocytes