If only a small volume of sperm is discharged into the vagina, an insufficient amount of enzymes might be released when sperm encounters the ovum. In that case, pregnancy would probably not result, because:
1. Peristalsis of the fallopian tube would decrease, making it difficult for the ovum to enter the uterus.
2. The block to polyspermy (cortical reaction) would not occur.
3. The fertilized ovum would be unable to implant in the uterus.
4. Sperm would be unable to penetrate the zona pellucida of the ovum.
4
Rationale:
1. "Peristalsis of the fallopian tube would decrease, making it difficult for the ovum to enter the uterus" is an incorrect statement.
2. The answer choice of the block to polyspermy (cortical reaction) not occurring is incorrect because it is mediated by release of materials from cortical granules below the ovum's surface, and not the result of low sperm count.
3. The fertilized ovum would be unable to implant in the uterus, because fertilization is unlikely to occur with a low sperm count.
4. Sperm would be unable to penetrate the zona pellucida of the ovum, because it takes hundreds of acrosomes (the result of the acrosomal reaction) to rupture and release enough hyaluronic acid to clear the way for a single sperm to penetrate the ovum's zona pellucida successfully.
You might also like to view...
The nurse is planning care for an elderly patient diagnosed with end-stage heart failure and a nursing diagnosis of Decreased Cardiac Output secondary to ineffective left ventricular function
What outcome would the nurse plan for this patient to measure improvement in cardiac output? a. Brisk capillary refill in feet bilaterally. b. Heart rate within expected range c. Breath sounds clear with no shortness of breath d. Regular pulse rhythm
Most medications used in nebulizers are available as premixed single doses. If a multiple-dose container
must be used, the amount to administer is calculated using any one of the three methods proportion, dimensional analysis, or formula method. Indicate whether the statement is true or false
After 15 days, a patient is released from an inpatient treatment unit where he had been committed by a judge for a period of 90 days. Upon discharge, in return for placement in a mental health group home, the patient is required to attend weekly appointments with his case manager and counselor, take all ordered medications, and meet twice monthly with his psychiatrist. He is told that the judge has ordered that the patient be readmitted to the inpatient facility if he fails to follow these requirements. This scenario includes examples of which of the following type(s) of admissions and/or releases? Select all that apply.
1. Involuntary admission 2. Long-term involuntary admission 3. Unconditional release 4. Conditional release 5. Involuntary outpatient admission
Which of the following statements regarding hypochromic microcytic anemia is INCORRECT?
A. Red cells are smaller than normal but contain a normal amount of hemoglobin. B. It is usually caused by chronic iron deficiency. C. It may occur in infants and children as a result of dietary deficiency. D. Most cases in adults result from chronic blood loss.