43 WJEC Biology AS Level - Marianne Izen - 2nd Edition Flashcards
What does squamous epithelium consist of?
Squamous epithelium consists of flattened cells on a basement membrane.
Where is squamous epithelium found?
They form the walls of the alveoli and line the renal (Bowman’s) capsule of the nephron.
What are the three main types of muscle tissue?
Muscle tissue comes in three main types, with slightly different structures and functions:
1. Skeletal muscle
2. Smooth muscle
3. Cardiac muscle
What is skeletal muscle attached to?
What does skeletal muscle generate?
Skeletal muscle is attached to bones.
It generates locomotion in mammals.
What type of cells are present in skeletal muscle?
How does the skeletal muscle contract?
It has bands of long cells, or fibres.
They give powerful contraction, but the muscle tires easily.
Why are skeletal muscles called voluntary muscles?
You can choose whether or not to contract these muscles, so they are called voluntary muscles.
Why are skeletal muscles called striped or striated muscle?
Because you can see stripes on them in the microscope, they are also called striped or striated muscle.
Why type of cells does smooth muscle have?
How does the smooth muscle contract?
Smooth muscle has individual spindle-shaped cells.
They can contract rhythmically, but they contract less powerfully than skeletal muscle.
Where does smooth muscle occur?
They occur in the skin, in the walls of blood vessels and in the digestive and respiratory tracts.
Why is smooth muscle called involuntary muscle?
You cannot control these muscles, so they are called involuntary muscles.
Why is smooth muscle called unstriped or unstriated muscle.
They do not have stripes and so are also called unstriped or unstriated muscle.
Which muscle is found only in the heart?
Cardiac muscle is only found in the heart.
Compare the structure and properties of cardiac muscle vs skeletal and smooth muscle.
Its structure and properties are somewhat in between skeletal and smooth muscle.
The cells have stripes, but lack the long fibres of skeletal muscle.
They contract rhythmically, without any stimulation from nerves or hormones, although these can modify their contraction.
Cardiac muscle does not tire.
What are the important points to remember when you use a microscope slide to make a high power drawing
When you use a microscope slide to make a high power drawing, the cells in your drawing must be clearly Identifiable in the specimen.
Someone looking down your microscope should be able to identify exactly which cells you have drawn.
What does connective tissue do?
Connective tissue connects, supports or separates tissues and organs.
Draw a labelled diagram of squamous epithelium
Draw a diagram of the three types of muscle fibre
What does this picture show?
