science
what is a cell?
a cell is the smallest unit of living matter.
how do living things grow?
living things grow by a cellular division called mitosis.
name 2 structures that plant cells have that animal cells dont have. explain their purpose.
chloroplasts; which is where photosynthesis takes place. food producers.
cell wall; it helps the plant keep its shape.
vacuole; its larger in the plant which helps it to keep its shape.
what is the purpose of respiration in humans?
it allows the red blood cells which carry oxygen to the cells of the body to re-oxygenate. it also allows them to get rid of CO2.
C6 H12 O6 + O2 = CO2 + H20 +HTP
glucose oxygen carbon dioxide water energy
what is mitosis? name the steps.
interphase, prophase, metaphase, anaphase, telophase, daughter cells.
if a group of organs work together to perform a specific job, what are they called?
a group of organs make the body system. cells-tissue-organ-system.
how do the skeletal and muscular systems work together to help us move?
it gives our body structure. our muscles have energy that allows us to move. it sends info from our brain to our muscles.
is a cell alive? how do you know?
cells are alive. they reproduce [mitosis], react, use energy [muscles moving] and grow [mitosis].
what function does a cell's DNA have? where is DNA found?
DNA is found in the nucleolus. it makes our genetics. It carries the information needed to make another cell.
chloroplasts are found only in plant cells. what is a function of a chloroplast and why are they not in animals cells?
they are living producers for the cell. they create photosynthesis. animals cells need energy in a different way. we cant use the suns energy and so do not have chloroplasts.
how are the needs of the cell related to what the organism needs?
Cells need certain products to produce energy. They require this through respiration in animal cells and photosynthesis in plant cells.
complete the graphic below
- - - -
cells - tissue - organ - system - organism
describe how the circulatory system relies on the digestive system to function.
it carries blood containing nutrients oxygen to our body. When we eat, our digestive system breaks down the food into usable nutrients. These nutrients are absorbed by our circulatory system and delivered to where our body needs them.
how would you determine if an unfamiliar item was alive? explain.
First: see if it reacts
Second: See if it has cells
Third: See what type of cell it is and what is in it (chloroplasts, cell wall, etc)
if all humans started from one tiny cell, why do you think we all look and act differently?
cellular division called mitosis. as cells divide to make 2 daughter cells we are able to grow.
explain what would happen to a human muscle cell that is not able to get enough oxygen.
If a human cell was not able to get oxygen, it would not be able to perform respiration. If it were not able to respire, it could not make energy (ATP) and would get tired (muscle fatigue).
how does a muscle cell rely on a red blood cell?
it brings oxygen and glucose and removes carbon dioxides and waste out.