Question

Seminal plasma in humans is rich in
A. Fructose and certain enzymes but poor calcium
B. Fructose and calcium but have no enzyme
C. Fructose, calcium and certain enzymes
D. Glucose and certain enzymes but has no calcium

Answer 1

Hint: Testis is the primary sex organ in males. The primary function of seminal fluid is to provide lubrication to the penis. It consists of male gametes known as sperms which are capable of fertilizing the ovum.

Complete Answer:
- The humans reproduce sexually. They have well developed reproductive systems. The primary reproductive organ in males is testis and the accessory glands are the prostate gland, a pair of seminal vesicles and bulbourethral glands. These accessory glands secrete seminal plasma.
- The seminal plasma mediates the chemical function of the ejaculate. The mixing together of the varied glandular fractions results in a coagulation of the fresh ejaculate within the rear vaginal cavity within a minute.
- In this way a deposit of spermatozoa is made within the vagina. After about 15-20 minutes the coagulated ejaculate becomes a fluid again.
- Due to its slight alkalinity (light alkaline buffer) it's also liable for creating a milieu beneficial for the spermatozoa during a vaginal surrounding that's normally maintained acidic.

Composition of seminal fluid:
- Amount: 2-6 ml
- pH value: 7-8 (light alkaline buffer)
- Seminal gland secretion 75% of the volume, alkaline fructose-rich secretion (1.5-6.5 mg/ml fructose), phosphorylcholine, ascorbic acid.
- Prostate secretion 20%-25% of the volume, biogenic amine (spermidine, spermine), citric acid, cholesterol, phospholipids, protease to fluidize the ejaculate (fibrinolysin, fibrinogenase).
- Other components Phosphate and bicarbonate as buffer, prostaglandin, hyaluronidase, cell detritus from Sertoli's cells, cells from preliminary stages of the spermiogenesis, lymphocytes.

So, the correct answer is option (C).

Note: The seminal fluid consists of sperms which are the male gametes. Fructose is the main component of this fluid which is detected during the rape investigations. The calcium ions in the fluid increases the mobility of sperms.