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Bell work. Sandworms are annelid worms that live on the seafloor. They absorb oxygen and excrete wastes through their skin. Which characteristic will best help the worm carry out these functions? large number of hearts large diameter blood vessels large mouth compared to body volume

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bell work
Bell work

Sandworms are annelid worms that live on the

seafloor. They absorb oxygen and excrete wastes

through their skin. Which characteristic will best

help the worm carry out these functions?

  • large number of hearts
  • large diameter blood vessels
  • large mouth compared to body volume 
  • large surface area compared to body volume
slide6
The two main functions of the cell membrane are: 1) to regulate what enters and leaves the cell and 2) to provide protection and support.
the composition of cell membranes is a double layered sheet called a lipid bilayer
The composition of cell membranes is a double-layered sheet called a lipid bilayer.

carbohydrate

DRAW THIS!

Lipid

Bi- means 2

Phosphate

Also called the phospholipidbilayer

slide9
Proteins are embedded in the lipid bilayer. Proteins form channels or pumps that help move large materials across the cell membrane.
slide10
Carbohydrates are attached to many proteins embedded on the outside of the bilayer.The carbohydrates allow individual cells to identify one another.
slide14
In a solution, particles are constantly moving.They collide with one another and tend to spread out randomly.
slide15
Particles move from an area of high concentration to an area of low concentration.This process is known as diffusion.
slide17
A concentration gradient is a difference between two concentrations.Diffusion is the movement of particles down the concentration gradient.

High Concentration

Low Concentration

slide18
When the concentration of a solute is the same throughout a system, the system has reached equilibrium.When equilibrium is reached, particles do continue to move across the membrane.
slide20
If a substance is able to diffuse across a membrane, the membrane is said to be permeable to it.If a substance cannot diffuse across a membrane, the membrane is said to be impermeable to it.
slide21
Selectively permeable means that some substances can pass across while others cannot.Biological membranes are selectively permeable.
isotonic means same strength hypertonic means above strength hypotonic means below strength
Isotonic means “same strength”.Hypertonic means “above strength”.Hypotonic means “below strength”.

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Label: Hypotonic

Water: High (outside cell)

Solute: Low

Label: Hypertonic

Water: Low (outside cell)

Solute: High

Label: Isotonic

Water: Same

Solute: Same

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