Biology revision on B1

Pregunta	Respuesta
State the definition of homeostasis and give two examples	Maintaining the right conditions inside your body so that everything works properly 1. Blood glucose 2. Osmoregulation
Why is homeostasis important?	Conditions in your body need to be kept steady so that cells in your body can function properly
What may happen if homeostasis is not maintained?	Your body will shut down
What happens to our urine if we do not drink enough water?	Urine will give off a strong sour smell with a deep colour of yellow
What happens to our skin when we become cold?	1. When cold, our hairs on our skin stand to trap a layer of air to keep us warm 2. Blood vessels near the surface of our skin constrict. **This means less blood flows near the surface, so less heat is transferred to the to the surroundings.
State the normal body temperature in humans?	37 degrees Celsius
Why is this temperature (human body temperature) maintained?	To fight off unfriendly bacteria's and illnesses
State the part of the brain that monitors temperature	The hypothalamus
State the sense associated with the organ; 1. Ears 2.Eyes 3. Skin 4. Tongue 5. Nose	1. Sound 2. Sight 3. Feel 4. Taste 5.Smell
Why is it an advantage for an organism to possess a nervous system?	Because it can then react to its environment
Name the parts of the central nervous system	Brain and the Spinal Cord
What is the peripheral nervous system made up of	Nerve fibres that branch off from the spinal cord and extend to all parts of the body, including the neck and arms, torso, legs, skeletal muscles and internal organs
What is the function of the Cerebellum?	Coordinates movement and balance
What is the function of the Medulla?	Controls automatic actions like heart beat and breathing
What is the function of the Frontal lobe?	Controls higher mental functions like choice and memory
What is the function of Cerebral hemisphere?	Responsible for numerical computation, language and emotions
What is a motor neuron and what does it do?	It is a nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland
What is meant by the term voluntary responses?	Voluntary responses are mainly under conscious control, but some voluntary movements, such as walking, require less conscious attention.
What is meant by the term involuntary responses?	There are two types of involuntary response, autonomic and reflex. Autonomic responses regulate the body's internal environment.

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