Multicellular Organisms (Content Revision Part B)

Question 4

Why type of organisation is a multicellular organism?

Answer 4

The organisation of a multicellular organism is hierarchical

Question 5

What is the connection between cells, tissues and organs?

Answer 5

Similar cells group together with a specific function to form tissues

Different tissues are organised into organs with a specific function

Different organs work together to form an organ system

Question 6

Why do organ systems work together?

Answer 6

Organ systems work together to maintain homeostasis within a multicellular
organism

Question 8

Ingestion

Question 9

Movement (Digestion)

Question 10

Mechanical and Chemical Digestion

Answer 10

Mechanical Digestion (Physical) is:
Chewing, tearing, grinding, mashing and mixing in the mouth. It is the physical breakdown of food. By breaking down the food by doing this the nutrients surface area is increased so chemicals can digest it quicker.

Carostotus pushes the food along through muscular contractions to the chemical digestive area.

Afterwards, Chemical Digestion takes place:
Is the chemical break down of ofod using enzymatic reactions to turn complex structures to simple, to improve the digestion of carbohydrates, proteins and lipids. i.e Saliva

For example, Carbs become Polysacc becoming monosacc (glucose), Or proteins become amino acids. Lipids become Fatty acids and lycerol. Therefore turning from complex to simple.

This is because the body cannot absorb complex molecules, so it gets broken down to simple molecules through this process.

Enzymes are organic catalyst which break food down.

Question 11

Absorption

Question 12

Elimination

Question 13

What are the five phases of digestion?

Answer 13

Ingestion
Movement
Mechanical and Chemical
Absorption
Elimination

Question 14

Heterotroph is?

Answer 14

A living organism that cannot synthesis the nutrients required for survival, meaning they require food to be supplied.

Question 15

What is the opposite of a heterotroph?

Question 16

Gastrointestinal (GI) tract is?

Answer 16

It is a tube within a tube, and has a direct link/ path between organs. It has structures including the mouth, pharynx, esophagus, stomach, small intestine, large intestine and rectum

label these

Question 17

What is the liver?

Answer 17

Detoxifier organ. Blood goes in and out and gets cleansed

Question 18

Pancreas

Answer 18

Involved in chemical digestion, releasing enzymes into the beginning part of the small intestine.