Science Lesson 4

Question 1

organism

Answer 1

living thing that can carry out life processes by itself

Question 2

Organisms made up of just one cell that perform all of the functions necessary for life

Answer 2

unicellular organism

Question 3

Do unicellular organisms have different levels of organization?

Answer 3

no

Question 4

What are the advantages of being unicellular organism?

Answer 4

need fewer resources and can live in harsh conditions *(eg. hot springs & very salty water)

Question 5

What is the disadvantage to being a unicellular organism?

Answer 5

the entire organism dies if the one cell dies

Question 6

What are the different levels of organization that multiccellular organisms are grouped into?

Answer 6

tissues
organs
organ systems

Question 7

How do multicellular organisms reproduce?

Answer 7

sexual reproduction–>single cell that then divides

Question 8

Describe some characteristics of multicellular organisms.

Answer 8

larger size
longer life span
can survive even if one cell dies

Question 9

Disadvantages of being multicellular?

Answer 9

• need more resources than unicellular org

- cells are specialized for certain jobs so they must depend on each other to perform all of the functions

Question 10

Tissues

Answer 10

a group of similar cells that perform a common function

Question 11

What are the four basic types of tissue?

Answer 11

nervous
epithelial
connective
muscle

Question 12

This tissue type functions as a messaging system within the body

Answer 12

Nervous tissue

Question 13

This tissue is protective and forms boundaries, such as skin

Answer 13

Epithelial tissue

Question 14

This type of tissue holds parts of the body together and provides support and nourishment to organs (eg. bones & blood)

Answer 14

Connective tissue

Question 15

this type of tissue helps produce movement

Answer 15

muscle tissue

Question 16

A structure made up of a collection of tissues that carries out a specialized function

Answer 16

organ

Question 17

group of organs that work together to perform body functions

Answer 17

organ system

Question 18

Give examples of organ systems

Answer 18

circulatory system

digestive system

Question 19

the arrangement of parts in an organism or an object

Answer 19

structure

Question 20

the structure of a cell, tissues, or organ determines the ________________.

Answer 20

function

Question 21

the activity of each part in an organisim

Answer 21

function

Question 22

the lungs are made up of millions of tiny air sacs called ______________

Answer 22

alveoli

Question 23

How does the structure of the alveoli relate to the function in lungs?

Answer 23

large number of alveoli increases the surface area of the lungs to let enough oxygen and CO2 move b/w the lungs and the blood

Question 24

What do all complex organisms need to survive?

Answer 24

receive nutrients
exchange CO2 & oxygen
have waste products taken away

Question 25

This system delivers nutrients to the body cells and carries away wastes

Answer 25

circulatory system

Question 26

This system carries oxygen to cell and removes carbon dioxide

Answer 26

circulatory system

Question 27

This system in most animals breaks down food mechanically & chemicallly

Answer 27

Digestive system

Question 28

Taking on oxygen is a function of which system

Answer 28

Respiratory system

Question 29

Explain how the digestive, nervous and respiratory systems are related.

Answer 29

The digestive system breaks down nutrients and it enters into the circulatory system. The circulatory system also takes oxygen from the lungs after the respiratory system exchanges the oxygen. The circulatory system carries the oxygen to other organs

Question 30

Describe how waste is taken care of by the body.

Answer 30

Sweat evaporates from the skin.
Solid wastes and some water move out as part of the digestive system
CO2 & some water are breathed out through the respiratory system
In humans, largest amount of excess water & wastes are carried by the blood to the kidneys where wastes are filtered out of the blood through tubules in the kidneys and excreted as urine.