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WorksheetsBiology 0610 4/6
Total questions: 27
Worksheet time: 15mins
choose the waste products
urea is formed in the liver as a result of an excess of amino acids.
Carbon dioxide is a waste product produced in cells during respiration
Excess water and salt - Filtered from the blood by the k idney and excreted as urine.
Sugar that is excess after eating unhealthy food
What is the kidney’s role in excretion?
breaks down many substances in the blood, including toxins
breaking food down, absorbing its nutrients and solidifying the waste
to filter waste and excess substances from the blood to be excreted from the body as urine.
digesting food and managing the use of sugar for energy after digestion.
Memorize this
Done
Don’t know it
What is the correct definition for motor (effector)?
carries nervous impulses from the central nervous system to the effector
carries impulses between different parts of the central nervous
system
carries impulses from a receptor to the spinal cord and brain
sends electrical impulses
What is the correct definition for relay (connector)?
sends electrical signals
It carries impulses between different parts of the central nervous system
carries nervous impulses from the central nervous system to the effector
carries impulses from a receptor to the spinal cord and brain
Which is the central nervous system?
Synapse and synaptic cleft
Brain and spinal chord
Motor and sensory neurons
Neurons and homeostasis
What is a synapse?
Where two neurons meet. It ensures unidirectionality of the impulses
a regulatory substance. It ensures unidirectionality of the impulses
a regulatory substance. It stimulates specific cells.
Where two neurons meet. It stimulates specific cells.
Fill in the blanks.
1) joint
2) synapse gap
3) chloroplast
4) reflex
1) mid-point
2) breaker
3) DNA
4) reaction
1) synapse
2) synapse gap
3) vesicles
4) reflex
1) synapse
2) synaptic cleft
3) vesicles
4) nervous impulse
what is being described?
“ A stimulus is detected by receptors. The receptor sends an impulse down the sensory neuron to the spinal cord. The relay neuron in the CNS passes the impulse to the motor neuron. The impulse travels along the motor neuron to an effector which reacts
to remove the organism from the danger.”
Motor neuron
Sensory neuron
Reflex arc
Homeostasis
What is the function of 1) iris and 2) lens in the eye?
1) iris refracts light into the eye
1) iris controls the amount of light entering the eye
2) lens changes shape to focus the image
2) lens allows light into the eye
What is the function of 1) retina and 2) fovea in the eye?
1) retina contains rod and cone cells which are sensitive to light
1) retina carries the impulse to the brain.
2) fovea carries the impulse to the brain.
2) fovea contains a large amount of cone cells to provide a clear image.
How does the eye behave at low light intensities?
the pupil dilates, circular muscles relax and radial muscles contract
pupil constricts, circular muscles contract and radial muscles relax
What is being described?
“ciliary muscles contract whilst the suspensory ligaments relax, making the lens fatter and curved”
Eye doesn’t allow light to pass
Eyes focus on far object
Eyes focus on near object
Eyes don’t focus
What are hormones?
molecules that travel in the blood and are used for signalling in the body.
Molecules that only increase heart rate
Molecules that chemically alter certain cells
Molecules that travel in the organs and are used for signaling in the body
What are differences between the endocrine system and the nervous system?
The E.S uses chemicals whereas the N.S uses
electrical signals.
Nervous impulses are short-lived whereas hormonal response
can be long-lasting.
Nervous impulses are much quicker than hormones
Nervous impulses travel along neurons whereas hormones travel in the blood.
What is homeostasis?
Maintaining constant water potential
Neutralization of acidity in certain organs
Maintenance of a constant internal environment in organisms
Regulation of blood flow
What happens when the level of glucose in blood is too high?
Water potential becomes high and water moves out of cells by osmosis (cells shrink)
Water potential becomes low and water moves out of cells by osmosis (cells shrink)
Water potential becomes low and water moves in to cells by osmosis (cells burst)
Water potential becomes high and water moves in to cells by osmosis (cells burst)
Which hormones is used to regulate blood-glucose concentration when it is too high and when it is too low?
High-testosterone
Low- adrenaline
High- adrenaline
Low- testosterone
High-glucagon
Low-insulin
High-insulin
Low-glucagon
Why is it important to maintain a constant temperature of 37° C and how is it maintained by the body?
Optimum temperature for enzyme action. It is regulated by hypothalamus in the brain which contains thermoreceptors
To prevent the body from shivering.it is regulated by the hypothalamus in the brain which contains thermoreceptors
Optimum temperature for enzyme action.it is regulated by bile produced in the liver
To prevent the body from shivering. it is regulated by bile produced in the liver
What is tropism?
regulating plant growth.
Growth movements in plants that occur in reaction to external stimuli
development of a plant from a seed
elongation of cells in shoots
What is being described?
“responses are controlled by plant hormones which cause cell elongation. it is made in shoot tips and moves through the plant by diffusion and active transport (short distances), or via the phloem (longer distances).”
Estrogen
Melatonin
Insulin
Auxin
What is a drug?
Substance that chemically alters the appearance of plants
Substance that has an effect on the chemical reactions that take place in the body
Substance that has only a physical impact on any living organism that it is in contact with
How do antibiotics kill bacteria?
Destroys cell wall, cell burst
Nucleus is altered to change the dna of bacteria
Flagellum is destroyed which prevents the bacteria from moving around
Cell completely dissolves
What does alcohol and heroin have in common?
Both are depressants, blocks synapses and releases neurotransmitters
Releases hormones, increases muscle mas and weight
Enhances athletic performance, energy levels and hand eye coordination
Releases dopamine, increase heart rate and blood pressure as well as the release of adrenaline
What type of drugs are anabolic steroids and testosterone?
Smoking drugs
Misused drugs
Performance enhancing
Antibiotics
What are the effects of smoking?
Chronic obstructive pulmonary disease (COPD)
Lung cancer
Coronary heart disease
What is the effect of tar (in cigarettes)?
Sticks to cilia which transports mucus away from the lungs, tar prevents this. Tar can also narrow airways
decreases the amount of oxygen in the blood
Causes high heart rate and blood pressure. Releases adrenaline too
Blocks arteries which prevents blood flow. Stents and angioplasty are required for this.
