What is the function of Adipokinetic hormone in the fly?

The insect adipokinetic hormones (AKHs) are a large family of peptide hormones that are involved in the mobilization of sugar and lipids from the insect fat body during energy-requiring activities such as flight and locomotion, but that also contribute to hemolymph sugar homeostasis.

What is Vitellogenesis in biology?

Vitellogenesis (also known as yolk deposition) is the process of yolk formation via nutrients being deposited in the oocyte, or female germ cell involved in reproduction of lecithotrophic organisms. In insects, it starts when the fat body stimulates the release of juvenile hormones and produces vitellogenin protein.

What changes occur during Vitellogenesis?

Vitellogenesis is a sequential process incorporating the following events: (1) induction of vitellogenin synthesis and its release into circulation, (2) transport of vitellogenin in the blood stream to the target tissue, (3) uptake of vitellogenin by the growing oocytes, and (4) the conversion of vitellogenin into …

What structure controls Vitellogenesis?

Vitellogenesis is under the control of estrogens and is temporally regulated in the ovary, the upper part of the reproductive tract. Yolk precursors are synthesized by the liver, secreted into the blood stream and incorporated into the forming yolks by receptor-mediated endocytosis.

What is the human growth hormone called?

growth hormone (GH), also called somatotropin or human growth hormone, peptide hormone secreted by the anterior lobe of the pituitary gland. It stimulates the growth of essentially all tissues of the body, including bone.

How many types of cleavage are there?

In the absence of a large concentration of yolk, four major cleavage types can be observed in isolecithal cells (cells with a small, even distribution of yolk) or in mesolecithal cells or microlecithal cells (moderate concentration of yolk in a gradient) – bilateral holoblastic, radial holoblastic, rotational …

What is Previtellogenesis?

Noun. previtellogenesis (uncountable) The processes leading to vitellogenesis quotations ▼

How is yolk produced?

A yolk (called an oocyte at this point) is produced by the hen’s ovary in a process called ovulation. Fertilization: The yolk is released into the oviduct (a long, spiraling tube in the hen’s reproductive system), where it can be fertilized internally (inside the hen) by a sperm.

Which organelle is responsible for Vitellogenesis?

So, the correct answer is ‘Lysosome’.

What are the 5 types of cleavage?

Types of cleavage

• Determinate.
• Indeterminate.
• Holoblastic.
• Meroblastic.