Mice that have been given morphine are very likely to develop blood poisoning because bacteria that normally reside in the intestine typically respond to morphine by migrating into the bloodstream. However, when mice are given both morphine and the new drug naltrexone, blood poisoning is much less frequent, although it does still occur. These results
provide support for researchers’ prediction that naltrexone will turn out to be toxic to certain types of bacteria.

Which of the following, if discovered to be true, would most seriously weaken the support for the researchers’ prediction?

A. After being administered to mice, naltrexone does not pass from the bloodstream into the intestine.
B. Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream.
C. Mice that have been given naltrexone but not morphine have no greater risk of developing blood poisoning than do mice that have not been given either substance.
D. The increased risk of blood poisoning is not the only harmful effect on mice of being given morphine.
E. Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice

Answers

Answer 1

Answer:

Answer:

Which of the following, if discovered to be true, would most seriously weaken the support for the researchers’ prediction?

The correct answear is B. Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream.

Explanation:

Naltrexone is a non-selective opioid antagonist, it competes with these at the level of the receptors and thus reduces their effects.

The responses A, C, D and E does not weaken the support for the

researches ´ predictions, and are not relevant to the argument.

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A client with a digoxin level of 2.4 ng/ml has a heart rate of 39. The health care provider prescribes atropine sulfate. Which of the following best describes the intended action of atropine for this client?

Answers

Answer:

Option A

Explanation:

Complete question is

Select one:

a. To accelerate the heart rate by interfering with vagal impulses.

b. To reduce peristalsis and urinary bladder tone.

c. To dry oral and tracheobronchial secretions.

d. To stimulate the SA node and sympathetic fibers to increase the rate.

Solution -

Atropine improves the performance and output of cardiac system by inhibiting the action of vagal or parasympathetic. The rate of discharge from the sinus node (SN) increases and hence the chances of ventricular ectopy reduces.

This drug must be administered rapidly to prevent reflexes of bradycardia. The common dosage regime is 0.5 mg per 3 minutes in adults or as per the instructions of doctor.

Hence, option A is correct

Which type of cell division does produce gametes?

Answers

The malehuman has a sperm cell and the female has an egg cell. The cells from the maleand female that combine to form a zygote are called gametes. The human spermand egg cells each contain 23 chromosomes. . A combination of gametes forms azygote with 46 chromosomes. The type of cell division that produces gameteswith half the normal chromosome number is the meiosis. Meiosis is the type ofcell division used in sexual reproduction. It will occur in the testes andovaries.

If one parent is heterozygous white (Ww) and the other is homozygous black (ww), give the phenotype and genotype ratios for this cross.

Answers

So if you cross a heterozygous white and a homozygous black, draw a punnet square. So the box is a 2 by 2 with Ww on the top two and ww on the side to. So in the top left corner, it would be Ww, top right, ww, bottom left, Ww, and bottom right, ww. So the possible phenotypes is half and half Ww and ww. This means that two of the potential phenotypes are Ww and ww, both occurring 50% of the time

(a) It is possible to measure a patient’s heart rate by either palpating their peripheral pulse, by observing their ECG, or by listening for the lub-dup through a stethoscope. However, patients with atherosclerosis of the femoral artery may not have a pulse in the popliteal artery or dorsalis pedis of the foot. Does this mean that they will also lack a heart beat (lub-dup) or QRS complex? Explain the relationship between a heart beat, pulse, and QRS complex. (B) Why is there a delay between systole of the ECG and the resulting pulse felt in the finger (R-Pulse)?

Answers

b)When you listen to the heart sounds, you are hearing the flow of blood which stops abruptly when a heart valve closes. This produces the "lub-dub" sounds. 1st heart sound (when the Mitral Valve closes) as the ventricle contracts (systole) and then 2nd heart sound (when the Aortic Valve closes) and the ventricle starts to fill again (diastole)
The pulse is the wave of pressure you can feel through the artery walls. This denotes systole.
The ECG's QRS complex is the electrical signal that tells the Ventricles to contract. You can see that the QRS occurs right at the beginning of systole and triggers Isovolumetric contraction.
So the QRS on the ECG, the pulse wave you can feel (ie. the rise in aortic pressure) and the 1st heart sound all signify SYSTOLE.
there a delay between systole of the ECG and the resulting pulse felt in the finger (R-Pulse) because it takes a little bit of time for the pressure to transmit through the body, as the finger is not on the heart (if it was there would be no delay)

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Answers

Answer:

Anaphase

Explanation:

During anaphase, the copies of the chromosomes separate and start moving apart, towards opposite ends of the cell. The spindle guides the movement of the chromosomes.

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the third phases is anaphase

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Answers

Evolution, because it can prove how organisms evolved from past lives.

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