CELLS
Who first discovered cork cells, and described them as small jail cells.
Robert Hooke
How many bones does a human adult have?
206
Name one thing muscles help do in your body.
move, pump blood, breathe, digest food
This is the largest organ in the body
The skin
What is the main function of the nervous system?
True or False: All cells come from existing cells.
True
Name one function of the skeletal system?
shape and support, movement, protects organs, produces blood cells, stores minerals
What kind of muscles move under conscious control?
voluntary muscles
Name one thing the skin is made of
protein, water, minerals, fats
The brain and the spinal cord create this part of the nervous system
Central Nervous System
This organelle creates energy for the cell to carry out its functions.
Mitochondria
This type of joint allows forward and backward motion, like in your knee.
These types of muscles tire quickly
Smooth Muscle
These parts of the skin help keep it moist and hair flexible
Oil Gland
This type of nerve cell passes information between neurons
Interneuron
These types of cells have a cell wall and chloroplasts.
Plant cells
This part of the bone produces blood cells.
Red bone marrow
Explain how muscles work
they contract and pull on eachother
In the presence of sunlight the skin creates this vitamin
Vitamin D
This signal causes a neuron to start a reaction
Stimulus
This organelle regulates what enters and exits the cell.
Cell membrane
Older peoples bones start to become more brittle as they age, what is this condition called?
Osteoporosis
This stretchy tissue attaches a muscle to a bone.
A tendon
This layer of the skin has cells that produce melanin
Epidermis
This part of the neuron allows the signal to travel faster down the axon
Myelin Sheath