Question

Use the below information to answer the remaining questions.

Due to government funding cuts, you have recently been appointed as head physiologist for the Centre for Disease Control, due to your unparalleled physiology knowledge and willingness to work for minimum wage.

Billions of people served worldwide by the popular fast food chain McDowell’s have all fallen ill due to a mysterious chemical being used in the beef. You are tasked with gathering as much information as possible about this chemical with a view to treating those affected.

Note: When people stop eating at McDowell’s, they are no longer affected, but apparently that isn’t an option, especially at 1:00am, nor is it an option to change the beef.

The chemical leads to a dramatically increased heart rate.

Through animal testing, you determine that the chemical increases heart rate by acting directly on the heart itself and affects autonomic nervous system signaling. It appears to have no direct effect on blood vessels. You have not determined if it is affecting other organ systems.

Assuming the drug only acts on one type of receptor, which of the following receptors could it potentially be acting on, given the above information? (select all that apply):

Group of answer choices

Acting on nicotinic receptors of both sympathetic and parasympathetic postganglionic neurons.

Acting on muscarinic receptors.

Acting on beta-1 adrenergic receptors.

Acting on beta-2 adrenergic receptors.

Acting on alpha-1 adrenergic receptors.

Acting on alpha-2 adrenergic receptors.

You are given the opportunity to interview the sufferers of the delicious beef scandal. Considering the receptors you have narrowed your search down to in question 10, which of the following questions could help you determine which receptors specifically are being affected by the chemical (select all that apply)?

Group of answer choices

Have you experienced any muscle weakness?

Have you had difficulty breathing?

Have your fingertips turned white (Generalised vasoconstriction)?

Have you experienced any erectile dysfunction?

Have you experienced an increased sensitivity to light (inability to constrict pupils)?

You ask the patients all of the above questions (even though some may have been irrelevant), and they answer “no” to all of them. Judging by this, the chemical must be: (select one)

Group of answer choices

activating nicotinic receptors.

blocking nicotinic receptors.

activating muscarinic receptors.

blocking muscarinic receptors.

activating beta-1 receptors.

blocking beta-1 receptors.

activating beta-2 receptors.

blocking beta-2 receptors.

activating alpha-1 receptors.

blocking alpha-1 receptors.

activating alpha-2 receptors.

blocking alpha-2 receptors.

I have answers for the first two but need the third. If you could still answer the first two to see If I was correct ?

Answer 1

1.Acting on beta 1 adrenergic receptors will make the heart rate to

increase and by acting on sympathetic and parasympathetic

post ganglion receptors

2.

3.Activating beta 1 receptors . Yes the activation of beta 1 receptors will only lead to the increasing heart rate