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Displaying 491-500 of 856 results.

On moonless nights, why should you look at stars from the side of your eyes rather than straight on?

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

Melatonin is a hormone made by the pineal gland, a small gland in the brain. Melatonin helps control your sleep and wake cycles. Use the Internet to research how the nervous and endocrine systems control the production and release of melatonin and how melatonin controls your sleep and wake cycles. Evaluate each statement below and select the statement that best describes the pathway.

Light on the retina stimulates the hypothalamus to send a signal to the pineal gland to stop producing melatonin, signalling the body to wake up.

Light on the retina stimulates the hypothalamus to send a signal to the pineal gland to increase the production of melatonin, signalling the body to wake up.

Light on the retina stimulates the hypothalamus to send a signal to the pineal gland to stop producing melatonin, signalling the body to go to sleep.

. Light on the retina stimulates the hypothalamus to send a signal to the pineal gland to increase the production of melatonin, signalling the body to go to sleep.

When the blood pressure drops, the body responds by

decreasing ADH production to decrease vasoconstriction

increasing ADH production to increase urine volume

increasing ADH production to increase vasoconstriction

decreasing ADH production to decrease urine volume

Nephrogenic diabetes insipidus is a condition where ADH is released by the posterior pituitary but the cells in the kidneys are unable to respond to ADH. This is in contrast to neurogenic diabetes insipidus where the body does not produce enough ADH. When the kidneys are unable to respond to ADH, the urine formation ______ and ADH secretion _______. Which of the following rows correctly completes the sentence above?

a. Urine Formation ADH Secretion Increases Increases in response to decreased water retention

b. Urine Formation ADH Secretion Decreases Decreases in response to increased water retention

c. Urine Formation ADH Secretion Decreases Increases in response to increased blood pressure

d. Urine Formation ADH Secretion Increases Decreases in response to decreased blood pressure

In an emergency situation, fluids are given intravenously to a patient. The fluids increase the blood volume. Increasing the blood volume can help to increase the patient’s blood pressure.A hormone in the body that increases blood pressure and the mechanism it uses to do this are, respectively

Hormone Mechanism Oxytocin Decreases smooth muscle contractions

Hormone Mechanism ADH Increases water absorption in the kidneys

Hormone Mechanism ADH Decreases water absorption in the kidneys

Hormone Mechanism Oxytocin

Increases smooth muscle contractions

Posted 6 years ago by miyaomar in Biology 30 | 1 answers
#and why alberta health care insurance should cover this #sensory pathway #tactileacuity

ADH is produced by the hypothalamus and stored in the posterior pituitary. It increases the reabsorption of water by the kidneys. ADH secretion is suppressed by diuretics such as alcohol and caffeine. Which of the following would be exhibited in someone after excessive alcohol intake?

. Decreased urination

. Increased blood pressure

. Low sodium levels in the blood plasma

Which of the following statements is NOT true about human growth hormone (hGH)?

Genetically engineered hGH has been used safely to treat dwarfism.

hGH is produced in the hypothalamus and secreted by anterior pituitary.

Excessive levels of hGH has been linked with diabetes mellitus.

After the growth plate has sealed, increased levels of hGH results in a widening of the nose.

Posted 6 years ago by miyaomar in Biology 30 | 1 answers
#growth #female reproduction #sensory pathway #receptors

Select the statements that correctly describe positive feedback pathways.

A sensor/receptor is required to monitor and limit levels. A sensor/receptor is unnecessary to monitor and limit levels. Feedback prevents homeostasis. Feedback contributes to homeostasis. Feedback stimulates the effector to continue to do the same thing. Feedback stops the effector from doing one thing and stimulates it to do the opposite. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. When a target level for a hormone is reached, feedback results in an increase of that hormone being released.

Posted 6 years ago by miyaomar in Biology 30 | 2 answers
#positive feedback #sensory pathway #receptors

Which of the following toxins can counteract the activity of diisopropyl fluorophosphate by preventing the binding of acetylcholine to the protein receptor?

Female black widow spider venom

. Botulinum toxin

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

Which of the following choices correctly describes the sensory pathway?

Sensory neuron → brain → motor neuron

Sensory receptors → sensory pathway → parietal lobe → motor pathway → muscles

Sensory neuron → spinal cord → motor neuron

. Sensory receptors → sensory pathway → spinal cord → motor pathway → muscles

Posted 6 years ago by miyaomar in Biology 30 | 1 answers
#sensory pathway #reflex arc #and sensory pathways #membrane

determine the number of sides in a regular polygon if each interior angle measures to 160

Posted 6 years ago by shaistaikhan in Math 20-2 | 3 answers
#angle properties in triangles and other polygons

Neurotransmitters are released into the synaptic cleft. Neurotransmitters bind to ion channels. Sodium ions enter into the dendrites. Neurotransmitters are returned to the axon terminal, broken down by the enzymes or diffused away from the synapse. Action potential arrives in axon terminal. Synaptic vesicles containing the neurotransmitters fuse with the presynaptic membrane. Ion channels open.

The sequence in which the events numbered above are involved in the signal transmission across the synapse is

Posted 6 years ago by miyaomar in Biology 30 | 1 answers
#action potential #receptors #sensory pathway

Which of the following statements about the intensity of a nerve response is true?

. All stimuli, regardless of the strength, will always generate a nerve impulse.

. A small voltage shift and a large voltage shift will yield the same nerve impulse as long as the stimulus reaches the threshold level.

. A stimulus resulting in a greater voltage shift will result in a stronger nerve impulse and increased sense of perception in the brain.

A stimulus reaching the threshold level may or may not propagate a nerve impulse.

Posted 6 years ago by miyaomar in Biology 30 | 2 answers
#action potential #tactileacuity #eye

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.

Posted 6 years ago by miyaaa in Biology 30 | 0 answers
#eye