Elec, magn, coordination

Question 1

What is the symbol for diode?

Answer 1

arrow shape in circle

Question 2

symbol for LED

Answer 2

diode with arrows pointing away

Question 3

Thermistor symbol

Answer 3

resistor plus hockey stick in front

Question 4

fuse symbol

Answer 4

Resistor with horizontal line running through it

Question 5

transformer symbol

Answer 5

a vertical line, and either side is a cartoon foot, with each toe parallel to each other, and perpendicular to the line

Question 6

what does a step-down transformer do?

Answer 6

A Step-down transformer decreases the voltage incoming to the site by increasing the electrical current

Question 7

What is the advantage of transmitting electricity at a high potential difference?

Answer 7

less thermal energy is transferred to the surrounding

Question 8

what is potential difference?

Answer 8

the difference in electric potential between two points.

Question 9

What is random error?

Answer 9

Unpredictable variation between measurements that leads to a spread of values about the true value

Question 10

what is systemic error

Answer 10

is a logical or proportional difference between observed and true values. (e.g., a miscalibrated scale consistently registers weights as higher than they actually are).

Question 11

sensory function

Answer 11

sensing changes in and out of body. Eyes sense light, ear responds to sound waves, stomach has stretch receptors (knows when full) chemical receptors detect acidity in the blood

Question 12

Integrative function

Answer 12

processing the info sent from sensory organs. This info is stored as memory. A proper response is initiated

Question 13

Motor function

Answer 13

Muscles and glands respond to stimuli, by contracting or secreting respectively.

Question 14

neurons

Answer 14

carry nerve impulses, just as electrons carry charge

Question 15

neuron structure

Answer 15

consists of a dendrite (receive data from another neuron) an axon (sends signals to other neurons) and a nucleus.

Question 16

What is myelin sheath?

Answer 16

a fatty material that surrounds the axon, and speeds up the rate that nerve impulses travel at.

Question 17

endocrine system

Answer 17

releases hormones in the body in response to changes in the body. E.g. insulin and glucagon (islets of Langerhans) are released from the pancreas when the blood glucose level is above or below the optimum. ADH is released when body is dehydrated, and tells the kidney to absorb more water, but if the body is very hydrated, less ADH is released.

Question 18

Compare features of the nervous and endocrine system

Answer 18

Nervous system consists of nerves, which transmit electrical impulses. Hormones, which are chemical messengers are carried in the blood, and these make up the endocrine system.

Question 19

motor neurons

Answer 19

Transmit impulses from sensory or relay neuron to an effector like a muscle or gland

Question 20

sensory neurons

Answer 20

transmits impulses from sensory receptor cell to relay or motor neuron

Question 21

relay neurons

Answer 21

transmit impulses between neurons

Question 22

What is action potential?

Answer 22

a rapid sequence of charges across a membrane.
an explosion of electrical activity that is created by a depolarizing current.

Question 23

What is concentration gradient in terms of action potential

Answer 23

the difference in ion concentrations between the inside of the neuron and the outside of the neuron (called extracellular fluid).

Question 24

papillae

Answer 24

small lumps of tissue on tongue