Final test science 8 secon

What is the nervous Systems?

• The control of body

• Consists of two divisions: the central nervous systems containing the Brian and spinal cord, and the peripheral nervous systems which is a network of nerves and neural tissues branching out throughout the body.

• System that containing the brain

• Neuron and cerebrum

select the correct option: Types of neurons

• Schwann cells, only found on peripheral nerves which can regenerate

• Interneurons are located entirely within the central nervous system.

• sensory receptors and transmit impulses to the central nervous system

• NERVE RECEPTORS, SENSORY NEURONS, INTERNEURONS and MOTOR NEURONS

Synapses…

• Nerve impulses are transmitted via branches

• The axon is covered with a insulating fatty layer called a myelin

• is a network of nerves and neural tissues

• Motor neurons cause muscle contractions and control secretions from glands and organs…

Taking up 7/8ths of the brain’s weight, the cerebrum governs all sensory and motor activity. This includes sensory perception, emotions, consciousness, memory, and voluntary movements.

• false

• true

It is a chemical change in which one or more substances are destroyed and one or more new substances are created. is call

• •aqueous solution (the substance is dissolved in H2O)

• spinal cord

• Chemical Reaction

• Substances created by the chemical change

Parts of a Chemical Reaction

• Chemical Reactions

• The brain and spinal cord are enclosed by 3 membranes, collectively known as the meninges

• one or more substances are destroyed

• Reactants, The arrow and Products

Evidence for a Chemical Reaction

• light or heat, Temperature, gas, Color change and Formation of a precipitate

• (s) = solid

  (l) = liquid

  (g) = gas

  (aq) = aqueous solution

• •Many small, nitrogen-containing molecules

• •6 Na (s) + Fe2O3 (s) à 3 Na2O (s) + 2 Fe (s)

which is one is The word equation

• Iron (s) + chlorine (g) à iron (III) chloride (s)

• Fe(s) + Cl2(g) à FeCl3 (s)

During a chemical reaction, atoms are neither created nor destroyed

• The numbers preceding the chemical formulae are coefficients. They are used to balance the reaction.

• Chemical reactions can never be read in terms of grams, only in terms of particles or groups of particles (moles).

• The oculomotor nerve controls muscles of the eye and eyelid

  IV. The trochlear nerve

• Conservation of Mass

What is wrong with this equation above? H2 (g) + O2 (g) = H2O (l)

• The skeleton equation

• Doesn’t it appear that one oxygen atom

• coefficients represent the # of molecules

• According to conservation of mass, the proper way to write this reaction is:

  2H2 (g) + 1O2 (g) ® 2H2O (l)