Question

29.Sarah and Mike have been trying to have a baby for over a year and decide to visit a fertility specialist. The clinician informs them that Mike’s sperm is not as viable as they should be. Which of the following could be a reason for this?

A. Mike’s sperm are diploid

B. Mike has been exercising too much

C. Mike is unhappy in his marriage

D. Mike tends to wear tight, skinny jeans that cause his scrotum to become closer to his body

28. The inner cell mass of a blastocyst becomes the embryo. If two inner cell mass form, what will be the result?

A. An ectopic Pregnancy

B. A singlet birth

C. Identical Twins

D. Paternal Twins

22. Patients can often alleviate symptoms of an asthma attack by using drugs called sympathomimetics that mimic the effects of norepinephrine. Based on this information, which is the most likely explanation for why patients with asthma have difficulty breathing?

A. Constriction of smooth muscle surrounding blood vessels leads to decreased blood flow to the lungs

B. Dilation of bronchial smooth muscle leads to diminished air flow

C. Interference with skeletal muscle neurons leads to decreased force of contractions of the diaphragm

D. Constriction of bronchial smooth muscle leads to diminished air flow

Answer 1

29. Correct answer is option d.

Option b isn't right because too much excersice causes azoospermia (very low sperm count) and in the question the condition is of asthenozoospermia( low motility )

pair of the testis is placed in a structure called as scrot*m which is located outside the abdominal cavity. The testis is located outside the body because sperms develop best at a temperature several degrees cooler than normal internal body temperature.

28. Option c is the correct answer because these Monozygotic twins form if the inner cell mass (ICM), the part of the embryo that will give rise to the fetal body, splits at the early blastocyst stage, 4–6 days post-fertilization.

Option D isn't the right answer because fraternal twins usually occur when two fertilized eggs are implanted in the uterus wall at the same time. When two eggs are independently fertilized by two different sperm cells, fraternal twins result. The two eggs, or ova, form two zygotes, hence the terms dizygotic and biovular.

22. Option D is the correct answer because Asthma is the result of chronic inflammation of the conducting zone of the airways (most especially the bronchi and bronchioles), which subsequently results in increased contractability of the surrounding smooth muscles. This among other factors leads to bouts of narrowing of the airway and the classic symptoms of wheezing.