Biology progress test two

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What is a stimulus? And what does CNS stand for?
A change in environment. And Central Nervous System.
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What is a) a peripheral nervous system? b) a receptor? and c) a neuron
a) Neurons that branch out from CNS. b) Cells that detect stimuli and c) A nerve cell.
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What is a) a reflex? b) a synapse and c) an effector?
a) An automatic response. b) A gap between 2 neurons and c) The muscle or gland.
3 of 40
The blank system carries blank along neurons enabling you to react to your blank and coordinates your blank. Fill in the blanks.
Nervous, impulses, surroundings, behaviour.
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State the nervous system process.
Stimulus-Receptor-Sensory neuron-CNS Relay neuron- Motor neuron-Effector
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Reflexes involve the brain, true or false? If false what does control it?
FALSE - it is the CNS and the spinal cord.
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The body when trying to warm up shivers which moves the muscles- using energy. Name 3 other things the body does when cold.
1. The body uses energy from food to warm up. 2. Goosebumps trap a layer of air around the body and each hair has a muscle that contracts to stand up straight. 3. Vasoconstriction makes the blood burrow deep into the veins to keep it warm.
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Name 3 things the body does when hot.
1. The hairs lie flat. 2. Sweat as evaporation transferrs heat to the environment. 3. Vasodilation-blood cells dilate which allows blood to go near the surface(flush) gets rid of infra red radiation.
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The cold and hot reactions are controlled by the hypothalamus which is where in the body?
In the brain.
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Homeostasis is keeping a ... complete the sentence.
Constant internal environment.
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What are the 4 main conditions we need to keep under control?
Sodium ions , water levels, temperature and glucose levels (blood sugar).
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Why do we need sodium ions is it to a) used to contract muscles b) to keep our heart going or c) both of them.
c) Both of them.
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What parts of the body are involved in homeostasis?
Kidneys, skin, liver and pancreas.
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What body part regulates water and mineral salts (ion) concentration and squeezes the blood to filter it and so wasted ions are filtered out through urine and ions needed are re-absorbed?
Kidneys.
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What body part regulates blood glucose levels?
Liver and pancreas.
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What regulates body temperature?
Skin
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The conditions in your body are controlled by the nervous system and what else? Also how?
Hormones (endocrine system). Keeping the levels monitored is the brains job which sends a hormonal response to the needed organs.
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What is thermoregulation?
How we keep/maintain a steady body temperature which is 37 degrees as this is the temperature that our chemical reactions work best at.
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Why must we maintain a steady temperature?
To prevent illnesses such as hypothermia and heat stroke.
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What type of feedback is homeostasis when we have a viral infection and why?
It's negative feedback due to when the body temperature increases, the homeostasis process will pull it back down to 37 degrees. Any change has a response that counteracts it.
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Hormones are blank that act like blank. They are secreted by blank and carried in the blank from organ to organ. Fill in the blanks.
Chemicals, messengers, glands and blood.
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When cells in different parts of the body recognise hormones how do they respond?
By making changes.
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What is the gland that is situated in the brain and releases FSH?
Pituitary gland.
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The gland sends the FSH where? Also what does FSH stand for? And what does it do?
Ovaries and it stands for Follicle Stimulating Hormone. It causes an egg to mature in the ovaries.
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What hormone goes back to the gland to stop FSH and starts the production of what?
Oestrogen starts the production of LH which causes ovulation.
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Why does the lining of the uterus become thicker and what with?
It becomes thicker with blood vessels and oxygen to help nourish the embryo.
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What common use of contraceptive contains oestrogen?
The oral pill.
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Oestrogen inhibits FSH why?
To stop eggs from maturing meaning that you can't get pregnant.
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Most pills also contain progesterone and lower levels of oestrogen but why?
To reduce the side effects such as blood clots.
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What are the pros of the pill.
Highly effective at preventing pregnancy and it reduces some risks of cancers.
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What are the cons of the pill.
Side effects for e.g blood clots, headaches. Also it doesn't protect against STD's.
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What about women who are having trouble getting pregnant?
FSH can be taken, this cause the eggs to grow and LH can be taken which cause the eggs to be released(ovulation).
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What does IVF stand for?
In vitro fertilisation.
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What happens in IVF?
FSH and LH are given to stimulate and mature several eggs. The eggs are collected from the mother and fertilised with the father's sperm. The fertilised eggs develop into embryos. Viable embryos are selected and inserted into the mother's uterus.
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Growth in plants is controlled by blank called blank. Plants use blank to respond to different things. Fill in the blanks.
Hormones, auxins, hormones.
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What is the plant hormone that responds to a) light, b) gravity and c) moisture.
a) Phototropism, b) geotropism and c) hydrotropism.
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The stem grows toward the light and the roots usually go down away from it, this is phototropism. However the roots are negatively photoropic. TRUE or FALSE?
TRUE
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What effect does gravity have on the stem and roots?
The stem is negatively gravitropic as it defies gravity which means that it grows upright and straight. The roots grow downwards due to gravity which is positively georopic.
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Roots will follow water to feed to the plant and the xylem ( cell in the plant) will absorb the water. TRUE or FALSE?
TRUE
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What does the auxin control?
The elongation/ growth of cells in certain parts of plants.
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Other cards in this set

Card 2

Front

What is a) a peripheral nervous system? b) a receptor? and c) a neuron

Back

a) Neurons that branch out from CNS. b) Cells that detect stimuli and c) A nerve cell.

Card 3

Front

What is a) a reflex? b) a synapse and c) an effector?

Back

Preview of the front of card 3

Card 4

Front

The blank system carries blank along neurons enabling you to react to your blank and coordinates your blank. Fill in the blanks.

Back

Preview of the front of card 4

Card 5

Front

State the nervous system process.

Back

Preview of the front of card 5
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