Anatomy
What filters blood in the kidneys?
The nephron
Sarcomere
What builds bone?
Calcium
Where is the site of gas exchange
Alveoli
Absorptive structure in small intestine?
Villi (finger like projections)
Lymphatic system
What carries oxygen?
Hemoglobin in red blood cells
What sends impulses?
Neurons
What are cell fragments for clotting?
Platelets (thrombocytes)
What do dendrites do on a neuron?
Receive impulses from previous neuron, short, highly branched
What does the nucleus do in a neuron
Nerve center
What does the soma (cell body) do in a neuron?
It contains organelles, produces proteins and molecules needed for a neuron to send and receive an impulse
What does the axon hillock do in a neuron?
It is where the axon joins the cell body
What does the myelin sheaths do in a neuron?
It is a lipid layer, insulates the axon, speeds up transmission of action potentials along the axon
What does the node of Ranvier do in a neuron?
Gaps in the myelin sheath along the axon, impulses skip to them
What does the axon do in a neuron?
Carries impulses away from the soma and toward the next neuron
What do the axon terminals do in a neuron?
They are fine projections at the end of an axon that pass the impulse to the next neuron
What does the sarcomere do?
Lines up to form myofibrils, where contraction occurs
What is the A-band?
Dark band, contains the entire length of a thick (myosin) filaments, stays the same no matter what
What is the I-band?
Light bands, contains only thin (actin) filaments
What is the H-zone?
Contains only thick (myosin) filaments
What is the Z disc/Z line?
Boundary between sarcomeres
What are thin filaments?
Actin, "two strands of pearls"
What are thick filaments?
Myosin, has "heads" to bind to actin
Pumps deoxygenated blood to the right ventricle