Biology Hedrick test 1 part 2

1.

1 point

Efferent neurons:

come from the CNS

lead to the CNS

2.

1 point

How does your brain interpret different amount of pressures being exerted on a single sensory receptor?

the greater the voltage change of the action potential, the greater the pressure

the lower the frequency of action potentials, the higher the pressure

the higher the frequency of action potentials, the higher the pressure

the less the voltage change during the action potential, the lower the pressure

3.

1 point

Absolute Refractory Period is caused by:

increased permeability to K+

K+ channel inactivation

increased permeability to Na+

Na+ channel inactivation

4.

1 point

The ganglia of the sympathetic nerve is located

nearer to the muscle

approximately in the middle of the spinal cord and muscle

sympathetic nerves do not have ganglia

nearer to the spinal cord

5.

1 point

A gauge of how far the actin has moved during a contraction is?

actin only moves during relaxations

actin does not move during contractions

the lengthening of the sacromere

the shortening of the sacromere

6.

1 point

In a fully contracted muscle, the myosin has moved how much?

myosin stays stationary during contractions and relaxations

the myosin moves the distance of the Y discs

the myosin moves 1/5th the length of the muscle fiber

7.

1 point

Type 1 muscle fibers contain lots of myoglobin, which give the muscle its dark appearance

True

False

8.

1 point

Parasympathetic system nerve cells have a ganglia located

nearer to the muscle the nerve is affecting

approximately in the middle of the muscle and spinal cord

nearer to the spinal cord

the parasympathetic does not have ganglion

9.

1 point

Isometric muscle contractions occur when you attempt to lift an incredibly heavy box, but are unable to lift it.

True

False

10.

1 point

Afferent neuron is one that

leads to the CNS

comes from the CNS

11.

1 point

Actin and myosin are highly attracted to one another, why are they not constantly attached?

actin and myosin are seperated by a sacromere

actin and myosin are not attracted to one another unless the myosin head is in the high energy configuration

the actin fibers are covered in a protein call tropomyosin that disallows myosin from binding to actin (unless the tropomyosin has a troponin bound to it)

actin and myosin are not attracted to one another unless the myosin head is in the low energy configuration

12.

1 point

Invertebrates have myelinated axons

True

False

13.

1 point

Concentric isotonic contractions occur when you are walking down hill

True

False

14.

1 point

A relative refractory period is a period during which a second action potential...

cannot be elicited

can be elicited easier than during normal resting membrane potential

can be elicited

can be elicited, but at the expense of a higher than normal stimulus

15.

1 point

a myelinated axon's action potential will travel faster than an unmyelinated axon.

True

False

16.

1 point

Eccentric isotonic muscle contractions happen when a muscle contracts as it lengthens

True

False

17.

1 point

The initial source of ATP during muscle metabolism is an aerobic process of Creatine phosphate combining with ADP to produce creatine and ATP

True

False

18.

1 point

Which of the following are a portion of the 3 levels of sensory organization?

transmit information from the CNS

all of the above

interface between stimulus energy and nervous system

none of the above

19.

1 point

The sympathetic division of the nervous system

slows down the heart

is associated with the flight or fight mechanism

brings the body to homeostasis after a flight or fight reaction

is located in the cervical section of the spinal column

20.

1 point

Ca2+ is required at

the end of the axon, so it can bind to a synaptic vessicle containing a neurotransmitter

the dendrite to open up the ligand gated ion channels

at the nodes of rainever

in order to induce an action potential

21.

1 point

The parsympathetic division of the nervous system is associated with

having nerve endings located in the lumbar and thoracic section of spinal chord

returning to homeostasis, ie to counter the sympathetic division

fight or flight mechanism

inhibiting the activity of the stomach and intestines

22.

1 point

Which of the following are not a role of ATP in muscle contraction

Hydrolysis of ATP "recharges" the myosin head, making it available to bind actin

ATP required for pumping Ca2+ back into the SR so relaxation can take place

ATP is required for pumping Ca2+ out of the SR, so that it can bind to troponin and reveal the myosin binding sites

ATP is required to break the actin-myosin bond in the presence of Ca2+

23.

1 point

Type ||B muscle fibers are the "dark meat" in chickens

True

False

24.

1 point

During an absolute refractory period, a second action potential:

can be elicited, but requires a higher than normal stimulus

can be elicited

cannot be elicited

25.

1 point

How does your brain know when there is more or less pressure being exerted on a portion of the brain, when multiple sensory receptors are being activated?

the fewer receptors that are being activated, the less the pressure

there is no way for the brain to determine pressure based solely on sensory receptors

the brain takes a guess

the more receptors that are activated, the higher the pressure