Tutor profile: Omnya E.
Subject: Biomedical Science
What is the difference between blackheads, whiteheads, and pimples?
The male hormone, testosterone, is responsible for all your acne woes. It triggers sebum overproduction (that oily sheen you get on your t-zone) which gets trapped in your pores causing spot formation. Since the skin is constantly renewing itself, dead skin cells get sloughed off but sometimes they get trapped in your pores as well. What you now get is a hair follicle (pore) filled with dead skin cells and sebum. Blackheads (or open comedones) form when the blockage is near the surface and exposed to the air. The sebum interacts with the oxygen in the air and turns black. Whiteheads (or closed comedones) form when the blockage is beneath a layer of skin and is not exposed to the air. No reaction with oxygen and thus the sebum remains white Pimples (red, inflammed) indicate infection with bacteria. Trapped sebum and dead skin cells is an ideal environment for bacteria to multiply as they feed on the excess sebum. Keep in mind that sebum is not a bad thing, your skin needs it to waterproof and maintain the moisture balance of your face. If this balance is out of order, you may experience dryness which leads to your skin producing more sebum to counteract the lack of sebum which in turn exacerbates pimple formation. The key to a pimple free face is pH balance, moisture and gentle exfoliation.
What are neurons and how are they specialised for their function?
The brain is like a machine, it needs an input of information and sends out an output of signals. Sometimes you need to react within split seconds to the dish flying at your head. How are you going to duck if your brain needs minutes to process and then respond? This is where neurons come in. They are like information highways, sending and transmitting signals with high speed to and from the brain. Neurons are very specialised due to their special features including: 1. Dendrites - like hands that reach out and connect to other neurons, this is how a neuron makes many synaptic connections due to the increased surface area. What is better than 1 hand? 10 hands. 2. Mylein sheath - tissue that insulates the nerve, just like an electric wire, to increase the speed of transmission 3. Nodes of Ranvier - gaps in the myelin sheath which help the signal jump from node to node, hopping along the axon for speedy transmission instead of propagating along the whole axon.
Subject: English as a Second Language
What is the difference between "breath" and "breathe"?
To differentiate between breath and breathe I use a phonetic technique to help with remembering which is which. Breath is a noun which means the air inhaled or exhaled; while breathe is the verb form, meaning to breathe in or to take in a breath. To help with remembering: think of when you are anxious and someone tells you to "just breathe..." hear the word in your head, the speaker is lengthening the word, saying it calmly, "br-eeea-the". You breathe in deeply, slowly. Use this scenario to help you differentiate that "breathe" is the verb. Think of a yoga class even, the yogi would be repeating calmly "br-eeea-the in, br-eeea-the out". And there you have it. The short, clipped BREATH is the noun. The longer relaxed BREATHE is the verb--just how you inhale.... and exhale...
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