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Related Concept Videos

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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Data Collection III01:05

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The physical assessment examines the patient for objective data that defines the patient's condition, and aids in formulating the nursing care plan. The purpose of physical assessment is a health status appraisal, which includes identifying health problems, and establishing a database for nursing intervention.
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Updated: May 24, 2025

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Occupational Physical Requirements for Astronauts.

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    Area of Science:

    • Aerospace Medicine
    • Human Physiology
    • Occupational Health

    Background:

    • Artemis program necessitates extended space missions and planetary surface operations.
    • Current health-focused tests may not predict astronaut occupational performance.
    • Shift towards operational performance and Physical Employment Standards is evident.

    Purpose of the Study:

    • To systematically review astronaut occupational tasks.
    • To identify physiological requirements for these tasks.
    • To provide an updated overview of relevant scientific literature.

    Main Methods:

    • Systematic literature search from 1970 to October 2023.
    • Screening of articles using Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.
    • Extraction of pertinent information from 10 selected studies.

    Main Results:

    • 14 distinct astronaut tasks were physiologically assessed.
    • Tasks include ambulation, device operation, emergency procedures, and construction-related activities.
    • Identified tasks provide a basis for understanding astronaut physical demands.

    Conclusions:

    • Physical Employment Standards for astronauts are not yet established.
    • Specific tasks identified can inform tailored occupational assessments.
    • Results support scientific task analysis for developing operational physical tests for astronauts.