1 . A example of a negative feedback loop would be: A] the release of a hormone
ID: 3475811 • Letter: 1
Question
1 .A example of a negative feedback loop would be:
A] the release of a hormone in response to a single stimulus.
B] the release of glucagon in response to low blood sugar.
C] the release of oxytocin in response to stretching of the uterus.
D] all of these.
2 . Lipid soluble hormones bind to intracellular receptors. TRUE OR FALSE
3. Proteins produced by a hormone-receptor binding will alter the cell’s activity. TRUE OR FALSE.
4. When compared to the autorhythmic fibers, contractile cardiac myocytes:
A] have leaky sodium channels to cause spontaneous depolarization.
B] have a peak action potential of about +10mV.
C] repolarize to about -60mV.
D] have a resting membrane potential of about -90mV.
E] depolarize when voltage-gated slow calcium channels close.
5. An Rh negative mother is pregnant with a fetus of unknown blood type. The father’s is Rh positive. Which of the following is true?
A] The mother may be given Rh immune globulin during pregnancy to prevent formation of antibodies to Rh because the fetus may be Rh positive.
B]It is not necessary to give the other Rh immune globulin during pregnancy to prevent formation of antibodies to Rh regardless of the fetus’ blood type.
C]The fetus must be Rh positive because it’s always the same as the father.
D]The fetus must be Rh negative because it’s always the same as the mother.
6. Barry has type O+ blood. His wife Anna has type A+ blood. Which type of antibodies would be present in both Barry’s and Anna’s blood?
A] anti-B antibodies
B] anti-A antibodies
C] anti-Rh antibodies
Explanation / Answer
Ans 1. The relaese of glucagon in response to low blood sugar this phenomenon work om negative feed back mechanism of body. Therefore correct answer is c.
The oxytocin release with uterus contraction is a positive feedback mechanism.
Multiple factor contribute in releasing of a hormone by the body
Ans 2. True. When lipid soluble hormones target specifoc segment of DNA By diffusing into the cell and this they do by attaching the intracellular receptor.
Ans 3: true. The statement is true. The example of this process can be use of estrogen receptor in breast cancer.
Ans 5. Correct answer is A. The mother may be given Rh immune globulin during pregnancy to orevent formation of antibodies to Rh regardless of fetus blood group to prevent the hemolytic anaemis of new born in subsequent pregnancy.
Other answers are not true.
Ans 6. O positive blood group has anti A and Anti B antibodies
A pos blood group has anti B antibodies.
Therefore correct answer ks anti B option A
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