ORGANISATION OF HUMAN BODY 3º

THE ORGANISATION OF THE HUMAN BODY

EMPEZAR

Different types of cells:

Most are MULTICELLULAR; some Fungus and some Protist (algae and protozoa) are UNICELLULAR)

All of us are UNICELULLAR

(in general: protists, fungus, plants and animals)

(plants, algae and fungus)

• Human cells are eukariotic and heterotrophic (they feed on organic material).
• Cells are structural and functional units of our bodies.
• All cells have a basic structure with the following parts: membrane, cytoplasm and nucleus.

Remember:

Structures in human cells:

OSMOSIS

DIFFUSION

Interactions with environment: TRANSPORT

ACTIVE TRANSPORT

ENDO/EXOCYTOSIS

Cell activity

chemical messengers

Interactions between cells: COMUNICATION

"The challenge of the month":

OSMOSIS??

Scientific method

Learning stations about tissues

Organs and systems:

Organs

Nutrition systems:

digestive, respiratory, circulatory and excretory

Interaction systems:

Systems:

nervous, endocrine, skeletal and muscular

Reproduction systems

Systems work together to keep the body functioning correctly. This coordination is carried out by the nervous and endocrine systems:

• First, receptors and sense organs detect stimulli.
• Then, the nervous system responds by sending nerve impulses to the different parts of the body to activate or inhibit them; the endocrine system uses hormones to control many of th reactions that take place in the organism.

Multicellular organisms need cells to work together in a coordinated way. This is why cells have to interact with each other, as well as with treir environment. In all these interactions are very important the cell membrane

Lipid bilayer

Osmosis

Osmosis is a type of diffusion that allows water to pass from a diluted area to a more concentration area, equalising the concentrations on each side of the membrane.

Gummy bear osmosis

You should demonstrate osmosis using gummy bears and respecting the steps of the scientific method. You can do it individually or in pairs.

What do you need?

• gummy bears
• salt

• water
• Three glasses
• a marker pen

take notes and images of the entire process; You must submit a Canva with the details of the experiment

Diffusion

Substances move from an area of higher concentration to one of lower concentration. Small molecules, such as oxygen and CO2, pass freely this way.