Section 2 Flashcards
Attributes shared by all organisms
- able to reproduce
- all able to grow and develop using energy
Body system
Group of organs that function together as unit
Digestive system
Breaks down food and absorb nutrient molecules
Body tissue and 4 groups and examples
Coaster together cells with similar structure and function
- Epithelial tissue
2 muscle tissue - Nerve tissue
- Connective tissue
Epithelial tissue
- act as barrier
- substances are absorbed or secreted
Skin
Muscle tissue
3 different types
- build of muscle cell
- contract and relax producing movement
- Skeletal muscle
- Cardiac muscle
- Smooth muscle - hollow walls of organs intestine
Nerve tissue
- sending signals to the whole body
- controlling movement
Connective tissues
- suggest and bind together cells and structure in the body
- found all over the body
- cartilage, skin, adipose tissue
Intestine layers
- epithelium
- connective tissue
- longitudinal smooth muscle layer
- nerve tissues
- circular smooth muscle layer
- connective tissues
- epithelium
- lumen - where the food is moving
What plantar skin consist of
Epidermis - constantly worn away, major barker against infection, regulate loss of water
Dermis - connective tissues, sweat glands, hair, follicles, blood vessels nerves
Subcutaneous layer - adipose tissue
Consistency of muscle
Cell nucleii
Striations
Adipose tissue
Cerebellum consistency
Nerve cells - contains organelle called cell nucleus
The outer pink region contain in,y few cells. Connect neurones together forming communication network
Lung tissues
Small blood vessels
Epithelial cells
Metabolism
Chemical process going on in the organism to sustain life
Cytosol
Gel like liquid - cytoplasm = mitochondria, ribosomes, cytosol
What happens in ribosome
Protein synthesis take place
What happens in mitochondrion
Organelle where energy from nutrient is converted into usable form that drives processes in the cell
Endoplasmic reticulum
- rough edoplastic reticulum— part with ribosomes
- sort protein and ensure they are transmitted in the correct part
- smooth endoplasmic reticulum - part with no ribosomes
* involved in production and processing fat
Cell membrane
- composed of fat and protein
- gases can move freely across
other molecules like sugar and protein can only cross via special channels
Nucleus
- contain DNA
-carries info necessary for the cell to synthesise protein - DNA connected to protein = chromosomes
46 chromosomes = 23 matching pairs from dad and mum
Nuclear membrane
- surrounds nucleus
- many small pores and holes that allow substances movement between nucleus + cytoplasm
Stem cell
Retain the ability to divide and replace old or damaged cells. Present in most tissues of multicellular organism
How much water is in the body
65%
Roles of water in human body
- Solvent in which chemical reaction take place
- Transport dissolved substances in the blood
- Lubricates the muscle and joints
- Help food move through guts
- Regulate body temperature
