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Displaying 1-10 of 241 results.

What effect does increasing GnRh have on: 

a) fsh

b) LH

Posted 7 years ago by Jasmine101 in Biology 30 | 4 answers
#female reproduction 

Which of the following correctly describes the olfactory sensory pathway? Select one:

a. Olfactory cells → olfactory bulb → sensory neurons → cerebrum
b. Sensory receptors → olfactory bulb → sensory neurons → temporal lobe
c. Sensory receptors → sensory neurons → olfactory bulb → cerebrum
d. Olfactory cells → sensory neurons → olfactory bulb → occipital lobe

Posted 6 years ago by aliya in Biology 30 | 1 answers
#oflactory cells #and sensory pathways 

Which of the following descriptions of photoreceptors in the eye is NOT correct?  

Select one:
a. Rods are concentrated in the fovea of the retina and function well in dim light.
b. Rods are concentrated at the periphery and function well in dim light.
c. Cones are concentrated in the fovea of the retina and function to detect colours.
d. Rods are sensitive to light and register black and white. Cones detect colours.

Posted 6 years ago by aliya in Biology 30 | 2 answers
#eye 

 

When comparing the tactile acuity of various body parts, what have you concluded about the number of receptors in the palm of your hand relative to the number of receptors on your shoulder?

 

 

Posted 6 years ago by in Biology 30 | 1 answers
#receptors 

Which of the following choices correctly describes the sensory pathway?
Select one:
a. Sensory neuron → brain → motor neuron
b. Sensory receptors → sensory pathway → parietal lobe → motor pathway → muscles
c. Sensory neuron → spinal cord → motor neuron
d. Sensory receptors → sensory pathway → spinal cord → motor pathway → muscles
 

All of the following statements correctly describe a polarized membrane EXCEPT which?

Select one:
a. An RMP of –60 mV indicates that there are more positive ions inside the axon than an RMP of –70 mV.
b. There is a difference in the charges found on the inside of the membrane to the outside.
c. A resting membrane potential (RMP) of –90 mV indicates the there are more positive ions inside the axon than an RMP of –70 mV.
d. There is a separation of the charge by a membrane, resulting in its ability to do work.
 
 

Events in Visual Perception 

Potassium channels opens, allowing potassium ions to move out. Some sodium channels open in the dendrite. All ion channels close and the Na+/K+ exchange pump starts working. Sodium ions diffuse toward the first node of Ranvier in the axon Lights hit the retina. The threshold level is reached at the first node of Ranvier in the axon Sodium channels open in the neural membrane of the axon, allowing the remaining sodium ions to move in.

List, in order, the events in visual perception that must occur for a person to see an object: Answer, Answer, Answer, Answer, Answer, Answer, and Answer.

Posted 6 years ago by aliya in Biology 30 | 0 answers
#brain #neuron #and sensory pathways #polarized 

A voltmeter was used to measure the potential difference across the cell membrane of a giant squid axon. 

Which of the following best explains the voltmeter reading?

Select one:
a. The sodium ions have rushed into the axon, and the sodium channels are closing.
b. The sodium potassium exchange pumps are working to take out the sodium ions and bring in the potassium ions.
c. The potassium ions have rushed out of the axon, and the potassium channels are slow to shut down.
d. The threshold potential has not been reached.
My answer is C but im not sure if it is correct or not. 

Posted 6 years ago by aliya in Biology 30 | 0 answers
#brain #potential 

Events in Visual Perception 

1.Potassium channels opens, allowing potassium ions to move out. 2.Some sodium channels open in the dendrite.3. All ion channels close and the Na+/K+ exchange pump starts working. 4.Sodium ions diffuse toward the first node of Ranvier in the axon 5.Lights hit the retina. 6The threshold level is reached at the first node of Ranvier in the axon 7. Sodium channels open in the neural membrane of the axon, allowing the remaining sodium ions to move in.

List, in order, the events in visual perception that must occur for a person to see an object: Answer, Answer, Answer, Answer, Answer, Answer, and Answer.

Posted 6 years ago by aliya in Biology 30 | 0 answers
#brain #potential #membrane #polarized #depolarization #neuron 

Which of the following choices correctly fills in the blanks? 

After repolarization, the sodium ions are found _____A_______ the neuron and the potassium ions are found ______B_____ of the neuron. This reversal of ions can be fixed by the action of ____________C______________. ____D____ sodium ions are taken out and ___E____ potassium ions are brought in.

Select one:
a. A  B  C  D  E outside  inside  Na+/K+ exchange pump two    three
b. A  B  C  D  E inside  outside   voltage gated channels  three two
c. A  B  C  D  E outside  inside    voltage gated channels  two    three
d. A  B  C  D  E inside  outside   Na+/K+ exchange pump  three two

Posted 6 years ago by aliya in Biology 30 | 0 answers
#polarized #repolarized #action potential 

The nerve impulses always travel in one direction from dendrites to axon terminals. What prevents an action potential from travelling backward?

Select one:
a. Hyperpolarization of the neuron makes the membrane more positive and prevents another action potential.
b. After repolarization, the reversal of ions prevents another action potential as there would not be enough sodium ions outside the cell to rush in.
c. After repolarization, the refractory period occurs, where the sodium ions are found outside the cell.
d. The refractory period prevents another action potential by lowering the threshold potential. My answer is B but not sure if its correct or not. 
 

When a single photon from a source of light hits the retina in the eye, it triggers a signal that travels along the optic nerve to the occipital lobe of the brain. 

The interaction of a photon with the photoreceptors in the retina first causes the movement of sodium ions into a sensory neuron. What happens after the movement of sodium ions?

Select one:
a. Sodium ions move out of a sensory neuron.
b. Potassium ions move into an interneuron.
c. Potassium ions move out of a sensory neuron.
d. Sodium ions move into an interneuron. 
my answer is c but not sure if its correct or not 
 
 
 
 

 

A neuron was isolated from structure number 3 in the diagram above. 

When comparing the velocity of action potentials, structure numbered 3 is much slower than that of structure numbered 4. 

Which of the following explains why this is?

Select one:
a. Structure number 3 has a larger diameter than structure number 4.
b. Structure number 4 does not have myelin sheaths.
c. Structure number 3 does not have myelin sheaths.
d. Structure number 4 has a larger diameter than structure number 2. I put C for this but again not sure if my answer is correct. 

Posted 6 years ago by aliya in Biology 30 | 0 answers
#brain #neuron #action potential #repolarized #depolarization #membrane 

Cochlear implants and hearing aids can be very expensive. In Alberta, the cost of cochlear implants and surgery are covered by Alberta Health Care Insurance Plan (AHCIP). Hearing aids are not covered by AHCIP. Should hearing aids be covered by the government?

To answer this question, select one of the following viewpoints: societal or ethical. Decide whether you are in support of or against public health care coverage of hearing aids. Ensure you have solid reasoning that is backed up with research, not just an opinion. Provide the URL of any websites you have used for research. 

(3 marks = 2 marks for the viewpoint and reasoning + 1 mark for citing source(s))

if you are able to help me with this question, that'd be awesome.. i have tried to find it online but nothing came up

Posted 6 years ago by aliya in Biology 30 | 1 answers
#hearing aids #ear #and why alberta health care insurance should cover this 

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