• 2. Molting of the insect cuticle
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    2. Molting of the insect cuticle

    The molting process begins when cuticular epidermal cells are stimulated by exposure to 20-hydroxyecdysone – the insect molting hormone. The hormone enters the epidermal cells where it stimulates genes related to molting and the formation of new cuticle. The activated epidermal cells undergo mitosis or grow by cellular enlargement. This is the period of growth to form a new, larger cuticle for the next instar. The existing structural cuticle separates from the epidermal cells. This is termed apolysis. The resulting ecdysial space between the endocuticle and the epidermal cells is filled with a gel that contains inactive chitinase and protease enzymes. A new outer epicuticle layer of cuticulin is secreted.…

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    How Dangerous Is Popping Pimples? – Dear Blocko #7

    Hey there! Welcome to Life Noggin! Donuts! Donuts everywhere!? How will I consume all these donuts!? Welcome to another episode of Dear Blocko! This is the show where I answer questions about your world, and mine! Let’s get started with our first one! Amber asks Dear Blocko Could Popping Pimples Kill You? I’m afraid to pop! I feel you, Amber. My adolescent years were the WORST! But pimples are actually pretty common and usually aren’t that much of a concern. They form when your dead skin cells mix with excess oil, clogging the pores on your skin and causing swelling. Bacteria can grow there, leading to an infection and that…

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    Integumentary System: Layers of Skin & Functions – Hypodermis

    Okay, last but not least in our discussion of the layers of the integumentary system is the hypodermis. So this hypodermis is not considered part of the skin proper. Skin proper is just the epidermis and the dermis. Just deep to the dermis is the hypodermis, composed of almost exclusively adipose tissue. It’s very important in terms of thermoregulation, as well as, energy storage. Also, you’re going to have vascular supply running throughout the subcutaneous layer. The more adipose tissue you have, the more blood vessels are gonna be created. The more vascularized this region is. So also very important, similar to the dermis, in terms of, blood running through…

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    1. Structure and functions of the insect cuticle

    In most insects, the integument forms a rigid exoskeleton that surrounds the outer surface of the animal. The exoskeleton serves a variety of functions: it gives the insect structure, prevents chemical and mechanical damage, protects against invasion by parasites and infection by microorganisms, inhibits water loss and serves as the attachment point of muscles for locomotion. It also forms the trachea of the respiratory system, forms a lining for the foregut and hindgut regions of the digestive system. and forms the wings in adult insects This cutaway view shows that the integument consists of a series of layers. The integument is separated from the hemolymph by the basement membrane the…

  • Four Unusual uses for Feathers – Feather Function #2
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    Four Unusual uses for Feathers – Feather Function #2

    Hi, my name is Steve Bush. There are about 10,000 species of birds in the world, and about 10,000 different uses for feathers. Today we’re talking about four uncommon uses for feathers. Four uncommon uses for feathers #1 Bristle Feathers See the whiskers on this nightjar? They’re not whiskers. They’re feathers! They’re formed by growing a feather without all the feathery parts. In function, they probably do a lot of the same work as whiskers. Scientists found that there are nerves to detect vibration connected to each bristle. So they probably help the bird feel around in the dark. Quick note: scientists are not totally sure on this one, but…

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    Why Do Paper Cuts Hurt So Much?

    You know the dreaded moment when you feel that familiar but nevertheless shocking surge of pain on your finger. You were just trying to mail a letter to your Great-Aunt Celia to thank her for the hand knitted mittens she sent you for Christmas, and then it happens. Your fingertip is searing in pain; it feels like a knife just sliced through your top few layers of skin. It’s such a small cut and barely even draws any blood, so why does it hurt so bad? Let’s delve into that on this episode of The Infographics Show, Why Do Paper Cuts Hurt So Bad? The dreadful paper cut is just…

  • Cuticle Application – Acrylic Nails
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    Cuticle Application – Acrylic Nails

    (chiming music) (upbeat music) – You know, it honestly doesn’t matter whether you’re at a trade show or a class. You’re always gonna have somebody who just does not understand the concept of cuticle application. So we wanna make this as easy as possible. And honestly, it’s not hard at all. You just have to understand, your brush acts as a barrier between the cuticle area and the acrylic. I’m gonna explain. I’m gonna take an acrylic pearl. I’m going to pick it up and I’m going to set it right to the center of the nail. Notice the space of the cuticle area. Immediately, the tip of the brush…

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    What makes tattoos permanent? | #aumsum

    What makes tattoos permanent? Glue sticks. No. Our skin has three layers, epidermis, dermis and hypodermis. Epidermis sheds thousands of skin cells every day. Hence, when we get a tattoo. The tattoo needles which are coated with colored pigment. Are inserted through the epidermis into the dermis. Thus, preventing the tattoo pigment from getting shed away. However, it is mainly our body’s immune response which makes tattoos permanent. What? But how? The tattoo needles create wounds in the skin, activating the immune response. Immune cells like macrophages. Reach the wounded site and start to eat the small particles of colored pigment and clean the area. Bigger pigment particles that cannot…