Blurd
What is the name of the liquid part of blood ?
plasma
What is the function of a red blood cell ?
To carry oxygen around the body.
State the 2 things that muscles can do. [they can only do these 2 things]
contract & relax
Name 2 places where you can find a hinge joint.
elbow
knee
What is the meaning of the word "function" ?
The function of something is what it does to help the organism live or move. The function of a structure is the "job" of the structure.
Name the 3 types of cells in blood
red blood cells
white blood cells
platelets
What is the function of a white blood cell ?
To fight pathogens.
State 2 ways that red blood cells are adapted for their function.
no nucleus
biconcave disc shape
Name 2 places where you can find a ball & socket joint.
shoulder
hip
What is the meaning of the word "pathogen ?
A pathogen is a germ or organism that can cause disease or illness.
What are platelets made of ?
Broken down parts of cells.
What structures provide the power needed for movement ?
muscles
How does having no nucleus help a red blood cell perform its function ?
Having no nucleusmeans that the red blood cell has more space to carry oxygen.
Name 2 nutrients carried in plasma.
glucose
amino acids
What is the meaning of the word dissolve ?
When a solid becomes part of a liquid and seems to disappear.
What percentage of blood is plasma ?
55%
What is the function of plasma ?
To carry waste from and nutrients to cells.
It is also where platelets are carried in the blood.
How does having a biconcave disc shape help a red blood cell perform its function ?
A red blood cell's shape gives more surface area for the diffusion of oxygen into and out of the cell.
Explain how muscles work in pairs to move your bones.
When a muscle contracts, it shortens and pulls a bone to create movement at a joint. While the other muscle relaxes and stretches out.
To move back to the original position, the second muscle contracts to pull the bone in the opposite direction, returning the limb to its original position.
What is a joint?
A place in the body where bones are connected and can move.
Name 2 waste substances carried in plasma.
carbondioxid
eurea
What is the function of platelets ?
stopping bleeding by sticking to damaged blood vessels,
to form a blood clot,
to prevent blood loss.
Red blood cells are flexible [can bend easily]. How does this help them do their job ?
Red blood cells are flexible so that they squeeze through tiny capillaries to deliver oxygen throughout the body.
Where are red blood cells made ?
Bone marrow
What are the two types of white blood cells ?
lymphocytes
phagocytes