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The blood from the body, which is low in oxygen enters the atrium via the sinus venosus, which contains the pacemaker cells that initiate the contractions. The blood is pumped into the ventricle by the atrium, which is a thin-walled muscular chamber.

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Having a supervising teacher.
Additional measures: safety glasses, gloves, apron

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fire

breakage of equipment

electrical shock

radiation

explosion

cuts from equipment

escape of pathogens

waste disposal

chemicals in eyes

sharp objects

heavy lifting

inappropriate behaviour

inhalation of gas/dust

rotating equipment

slipping, tripping, falling

allergies

chemicals on skin

vibration and noise

falling objects

special needs

runaway reaction

pressure

heat and cold

other risks

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I, Lucy Martin, agree to conduct this experiment safely in accordance with school rules and teacher instructions.

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I have read and understood the potential hazards and standard handling procedures of all the equipment, chemicals and living organisms.

I have read and understood the (Material) Safety Data Sheets for all chemicals used and produced.

I/we have copies of the (Material) Safety Data Sheets of all the chemicals available in or near the laboratory.

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Potential hazards
- Possibility of splinters, especially if damaged.

Standard handling procedures
- Check for splinters before use.

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Potential hazards
- Scalpel blade may cause severe injury if used inappropriately. Only allow responsible students to use scalpel.

Standard handling procedures
- Store scalpel blades where they will not be stolen or used inappropriately.

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Potential hazards
- Scratched or dirty goggles may hinder vision, causing headaches during prolonged use.

Standard handling procedures
- Avoid scratching lenses during storage. Check and, if necessary, clean goggles before each use.

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Potential hazards
- ALLERGY ALERT. May easily be punctured, allowing entry of liquid. Latex may cause allergic reaction to some people. Check for latex allergies before use. Check for talc allergies, if gloves are powdered with talc. Organic solvents may damage gloves.

Standard handling procedures
Keep out of sunlight. Take care not to puncture. Check for punctures before use. Check gloves are appropriate for chemicals to be used.

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Potential hazards
- Can be used to stab another student.

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Potential hazards
- Breakage of tray, if made from glass.

Standard handling procedures
- Sweep up broken glass with brush and dustpan; do not use fingers.

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Sheep's also have a four chambered heart like humans

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Fish possess a two chambered heart also know at the true heart.

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Simpler to the human heart a chickens heart has four chambers.