c because fungi are.prokaryotic heterotrophes
Answer:
yeah there is
Explanation:
plants are multicellular organisms that make food from sunlight
Answer:
a. will contain either a Y chromosome or a X chromosome but not both.
c. reach maturity in the seminal vesicles.
d. contain enzymes in their heads which facilitate penetration of ovum.
Explanation:
Spermatogenesis is a complicated process. It occurs in the seminiferous tubule / seminal vesicle of the testis. The spermatogenesis occurs in 2 steps. In the first step, spermatids are produced. In the second 2nd step, spermatids undergo metamorphosis and form spermatozoa.
The process of formation of spermatozoa is known as spermatogenesis. These are formed from the primary germ cells of the testis. It occurs in 3 phases- multiplication phase, growth phase, and maturation phase.
The maturation phase is important. Here primary spermatocyte divides 2 times. The first division is a meiotic division that produces 2 haploid cells, called secondary spermatocytes.
The second division is a mitotic division. Thus from 2 secondary spermatocytes, 4 spermatids are formed. Further by metamorphosis, the spermatids result in spermatozoa. The spermatozoa have 4 parts - head, neck, middle piece, and a tail. The head is a conical shape. It consists of a nucleus and acrosome.
Acrosome is also called head cap. It secretes a tissue dissolving enzyme which helps to rupture the egg cell. Thus the sperm can penetrate the ovum.
Answer:
1. Increases output of enzymatic-rich pancreatic juice- cholecystokinin
2. Increases output of pancreatic juice rich in bicarbonate ions- secretin
3. : Increases HCl secretion and stimulates contraction of intestinal muscle- gastrin
4. : Stimulates insulin release and mildly inhibits HCl production-Gastric inhibitory peptide
Explanation:
1. Cholecystokinin is secreted by the duodenum of the small intestine and serves to stimulate the release of enzymes of the pancreas. In response to the presence of fatty acids and partially digested proteins in the duodenum, cholecystokinin triggers the release of pancreatic juice having enzymes and also stimulates the emptying of bile in duodenum.
2. The secretin hormone is also secreted by duodenum in response to the presence of acidic chyme in duodenum. The hormone triggers the release of sodium bicarbonate from the pancreas in pancreatic juice.
3. Hormone gastrin is released from the mucosa of the stomach in response to distension of the stomach by food and triggers gastric glands to secrete the enzyme pepsinogen and HCl. It also triggers contraction of lower esophageal sphincter and relaxes pyloric sphincter.
4. Gastric inhibitory peptide hormone is released from duodenum in response to the presence of glucose-rich partially digested food in the duodenum. The hormone stimulates the secretion of insulin from the pancreas.