
O
Go to “O” lessons: K-3rd grade / 4th-5th grade / 6-8th grade / 9-12th grade
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Occupational Safety and Health
Practices, strategies, and laws implemented to protect workers' well-being in the workplace including measures to prevent accidents, provide proper training, and ensure a safe working environment.
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Occupational Safety and Health Administration
Occupational Safety and Health Administration (OSHA) is a U.S. federal agency responsible for setting and enforcing standards to ensure safe and healthy working conditions.
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Occupational Stress
Occupational stress is the physical and emotional strain experienced in the workplace due to factors such as workload, interpersonal relationships, and job demands.
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Olfaction
Sense of smell, allowing the detection and identification of odors, olfaction involves the nose and specialized sensory cells that send signals to the brain, where smells are processed and interpreted.
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One Health
Considering the health of all living things and the environment, One Health promotes a holistic and collaborative approach to solving health challenges and preventing the spread of diseases.
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Ontology
A branch of philosophy that explores the nature of being, existence, and reality. It deals with questions about what entities exist, how they relate, and the nature of their properties.
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Oocyte
An immature egg cell found in the ovaries. It is the precursor to a mature egg (ovum) and undergoes a series of developmental stages during the female reproductive cycle.
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Opioids
A class of drugs, including prescription pain relievers and illegal substances like heroin, known for their analgesic properties, potential therapeutic effects, and addictive effects.
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Oral Health
Pertains to the well-being of the mouth, teeth, and gums through practices such as regular dental care, hygiene, and preventive measures for maintaining oral hygiene.
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Organism
A living thing capable of carrying out life processes such as growth, reproduction, and response to stimuli. Organisms can be unicellular or multicellular, and they exhibit diversity across different kingdoms.
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Orgasm
Orgasm is the climax of sexual arousal, resulting in intense physical and psychological sensations. It is an individual, intimate, and natural aspect of sexual activity.
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Ovaries
Organs that are responsible for producing eggs and hormones like estrogen and progesterone. Hormones produced by the ovaries play a role in the menstrual cycle and are integral to fertility and reproductive function.
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Ovulation
Ovulation is a key phase in the menstrual cycle, with hormonal changes facilitating the release of an egg for potential fertilization and subsequent pregnancy.
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Ovum
Ovum, also called an egg, is a female reproductive cell produced in the ovaries. It contains half of the genetic material required for reproduction and is necessary for fertilization by sperm. When an egg is fertilized by a sperm cell, it can develop into an embryo.
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Oxytocin
A hormone produced by the hypothalamus and released by the pituitary gland. Oxytocin plays a role in social bonding, trust, and emotional responses and is involved in various physiological processes, including contraction of the uterus during labor and milk ejection during breastfeeding.
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Ozone
A molecule consisting of three oxygen atoms, ozone plays a role in the Earth's atmosphere. The ozone layer protects life on Earth by preventing excessive ultraviolet radiation from reaching the surface.
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