Question

Which of the following statements is correct?
A. Monkeys, apes and humans exhibit Eestrous cycles.
B. Urine is pale yellow and slightly alkaline.
C. Lots of enzymes are present in bile juice.
D. Ovulation in humans is spontaneous.

Answer 1

Eestrous cycle is defined as a set of recurring changes that are induced by reproductive hormones. Ovulation is the process of release of eggs from ovaries. Menstrual cycle is defined as regular natural change that occurs in the female reproductive system.

Complete Answer:
- Urine is liquid by product of metabolism in humans and other animals. Urine is a transparent solution which ranges from colorless to amber but urine is usually pale yellow. Urine is slightly acidic.
- Monkeys, apes and humans exhibit menstrual cycles. Eestrous cycle is seen in cows and sheep.
- The ovulation process occurs around the 14th day of menstrual cycle in humans. This is referred to as cyclical spontaneous ovulation. The menstrual cycle happens due to rise and fall of estrogen.
- Bile is a fluid that is made and released by the liver. Bile is made of bile acids, cholesterol, phospholipids, bile pigments, electrolytes and water. Bile is a digestive juice. Bile does not contain any digestive enzymes.

So, the correct answer is D.

Note: The process of ovulation is controlled by the hypothalamus of the brain. Ovulation is controlled by the release of hormones secreted in anterior lobe of pituitary gland LH and FSH. After ovulation, the egg will be available to be fertilized by sperm. Eestrous cycle is the main reproductive cycle of other species females of non primate vertebrates, example- rats, mice, horses. In humans, ovulation occurs about midway through the menstrual cycle.