Homeostasis

Question 1

A state of relatively constant internal physical and chemical conditions is called

Answer 1

homeostasis

Question 2

What plays an important role in maintaining homeostasis inside a cell

Answer 2

any of its membranes - whether it be the cell’s membrane, the nuclear membrane, the membranes within a chloroplast or mitochondria.

Question 3

The process where particles move from a higher concentration to lower concentration is called…

Answer 3

diffusion

Question 4

The diffusion of water through membranes in order to maintain homeostasis is called

Answer 4

osmosis

Question 5

If a water based solution has more molecules of sugar on one side of the membrane it is said to be

Answer 5

hyperonic

Question 6

If a water based solution has a lower concentrate of sugar on one side of the membrane it is said to be

Answer 6

hypotonic

Question 7

In relation to water, are our cells hyper or hypotonic? why?

Answer 7

hypertonic because our cells have salts, sugars and proteins along with water

Question 8

what is the difference between facilitated diffusion and regular diffusion?

Answer 8

facilitated molecules can only diffuse across the membrane through special protein channels and regular diffusion requires no channels.

Question 9

I water an example of facilitated diffusion or regular inside our cells?

Answer 9

facilitated

Question 10

why is water facilitated diffusion in a cell?

Answer 10

because the cell’s membrane has a hydrophobic center in the membrane that repels water, so a channel needs to be there.

Question 11

What is the name of the protein channel for water?

Answer 11

Aquaporin

Question 12

Does diffusion require extra energy from a cell?

Answer 12

no. only active transport.

Question 13

isotonic?

Answer 13

water passes a membrane until the concentration of molecules are even.

Question 14

When a cell has to use energy in order to get molecules to pass through the cell membrane, it is called?

Answer 14

active transport

Question 15

2 kinds of active transport?

Answer 15

endocytosis and exocytosis

Question 16

examples of endocytosis?

Answer 16

phagocytosis - when our white blood cells engulf invaders

Question 17

examples of exocytosis?

Answer 17

contractile vacuole ( which removes water from a cell)

Question 18

where does a cell get its energy from for active transport?

Answer 18

ATP

Question 19

How does ATP force movement? What does it activate?p

Answer 19

proteins in the membrane are activated to pump small molecules in or out

Question 20

what happens when there is equilibrium?

Answer 20

homeostasis for CHEMICAL and PHYSICAL conditions in a cell

Question 21

In what 4 ways do unicellular organisms maintain homeostasis?

Answer 21

1. grow. 2. reproduce. 3. transform energy. 4. respond to the environment

Question 22

Are there more unicellular or multicellular organisms on earth?

Answer 22

unicellular - mainly plankton

Question 23

A major difference between unicellular and multicellular homeostasis is ?

Answer 23

cells need to be specialized in order for multicellular homeostasis to work (like the instruments in a symphony played in the same key).

Question 24

If cells are specialized, how do they communicate?

Answer 24

chemical signals and receptor sites

Question 25

a cell with a receptor can respond to the chemical signal of a cell but where are these receptors located on the cell?

Answer 25

cell membrane, nuclear membrane, mitochondria membranes

Question 26

Some cells have more mitochondria than others ( they need more energy) . Where is 1 sensory organ on our heads that carries a lot of mitochondria?

Answer 26

Eyes….in particular, the optic nerve. Eyes are sensory organs that need to stay active.