CK12 Life Science

What happens after the oval window in the ear passes vibrations to the cochlea? Which parts of the ear sense changes in the bod ...

Points to Consider Our senses, along with the rest of our nervous system, help us stay safe. At least they do if our nervous sy ...

Central Nervous System Infections When you think of infections, you probably think of an ear infection or strep throat. You prob ...

A condition calledReye’s syndromecan occur in young people that take aspirin when they have a viral infection. The syndrome caus ...

may help relieve this type of headache (Figure20.35). Mild pain relievers such as ibuprofen may also help. Figure 20.35: Sometim ...

Table 20.3: (continued) Disease Cause Symptoms Parkinson’s Disease An abnormally low level of a neurotransmitter affects the par ...

Spinal Cord Injuries Spinal cord injuries interrupt messages between the brain and body. They may cause a person to lose the abi ...

Figure 20.37: Drugs that are prescribed by a doctor can be misused just like illegal drugs. ( 33 ) ...

Types of Psychoactive Drugs Drugs like alcohol, marijuana, and cocaine affect the brain. Drugs that affect the brain are calledp ...

intended. Drug abuse may lead tophysical dependenceon the drug. This occurs when drug abusers need a drug to feel well physicall ...

oxygen, which it needs to function normally. The saying “use it or lose it” applies to your brain as well as your body. This mea ...

The use of psychoactive drugs can lead to drug abuse or addiction. You can make choices that will help keep your nervous system ...

concussion Bruise on the surface of the brain; the mildest and most common type of brain injury. depressant drug Psychoactive dr ...

seizure Period of lost consciousness that may include violent muscle contractions. stimulant drug Psychoactive drug that speeds ...

(7) http://en.wikipedia.org/wiki/Image:Hypermetropia.svgMyopia,Hyperopia. CC-SA. (8) http://en.wikipedia.org/wiki/Image: Fileisn ...

(25) http://commons.wikimedia.org/wiki/Image:MooreStreetDublin.jpg. CC-BY-SA. (26) http://commons.wikimedia.org/wiki/File:Centra ...

Chapter 21 Diseases and the Body’s Defenses 21.1 Lesson 21.1: Infectious Diseases Lesson Objectives List common causes of infec ...

another. This is why the diseases they cause are “catching.” Types of Pathogens Living things that cause human diseases include ...

Figure 21.2: Ringworm isn’t a worm at all. It’s a disease caused by a fungus. The fungus causes a ring-shaped rash on the skin, ...

Viruses are nonliving particles that take over living cells in order to multiply. Viruses cause many common diseases. For exampl ...