Atom
Accuracy reviewed
The smallest chemical unit of an element that retains the properties of that element. Contains electrons, protons, and neutrons.
Body Organization
HESI A2
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447 HESI A2 flashcards. Pick a category below or start drilling.
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Deck 1 of 15 · Cards 1–30 of 447
Molecule
Accuracy reviewed
A chemical combination of two or more atoms. Bonds may be covalent or ionic.
Body Organization
Cell
Accuracy reviewed
The smallest and most fundamental unit of life. The basic building block of the human body.
Body Organization
Organelle
Accuracy reviewed
A specialized structure within a cell that performs a specific function (e.g., mitochondria, nucleus).
Body Organization
Tissue
Accuracy reviewed
A group of similar cells working together to perform a specific function.
Body Organization
Organ
Accuracy reviewed
A structure made up of multiple tissue types performing complex functions.
Body Organization
System (organ system)
Accuracy reviewed
Several organs working together to carry out a specialized function (e.g., respiratory system).
Body Organization
Levels of structural organization
Accuracy reviewed
From simplest to most complex: organelles, cells, tissues, organs, systems.
Body Organization
Epithelial tissue
Accuracy reviewed
Tissue that performs excretion, absorption, secretion, diffusion, and protection.
Body Organization
Connective tissue
Accuracy reviewed
Tissue that provides a supporting network for organs and muscles.
Body Organization
Nerve tissue
Accuracy reviewed
Tissue that controls and coordinates body activities.
Body Organization
Muscle tissue
Accuracy reviewed
Tissue that mediates movement.
Body Organization
Transverse plane
Accuracy reviewed
A body plane that divides the body into upper (superior) and lower (inferior) portions.
Body Organization
Frontal (coronal) plane
Accuracy reviewed
A body plane that divides the body into anterior (front) and posterior (back) portions.
Body Organization
Sagittal plane
Accuracy reviewed
A body plane that divides the body into left and right portions.
Body Organization
Median (midsagittal) plane
Accuracy reviewed
A sagittal plane that runs through the midline, dividing the body into equal left and right halves.
Body Organization
Dorsal cavity
Accuracy reviewed
Body cavity composed of the cranial cavity and the spinal (vertebral) cavity.
Body Organization
Ventral cavity
Accuracy reviewed
Body cavity containing the thoracic, abdominal, and pelvic cavities.
Body Organization
Posterior
Accuracy reviewed
Anatomical directional term meaning toward the back of the body. Opposite of anterior.
Body Organization
Anterior
Accuracy reviewed
Anatomical directional term meaning toward the front of the body. Opposite of posterior.
Body Organization
Medial
Accuracy reviewed
Anatomical directional term meaning closer to the midline. Opposite of lateral.
Body Organization
Lateral
Accuracy reviewed
Anatomical directional term meaning toward the side of the body. Opposite of medial.
Body Organization
Superior
Accuracy reviewed
Anatomical directional term meaning above.
Body Organization
Inferior
Accuracy reviewed
Anatomical directional term meaning below.
Body Organization
Ventral
Accuracy reviewed
Anatomical directional term meaning toward the front.
Body Organization
Dorsal
Accuracy reviewed
Anatomical directional term meaning toward the back.
Body Organization
Lymph
Accuracy reviewed
A body fluid that moves through lymphatic vessels and empties into large veins.
Lymphatic and Immune
Erythrocyte
Accuracy reviewed
Red blood cell. Erythr- = red, -cyte = cell.
Lymphatic and Immune
Leucocyte (leukocyte)
Accuracy reviewed
White blood cell. Leuko- = white, -cyte = cell.
Lymphatic and Immune
Thrombocyte
Accuracy reviewed
Platelet. Thrombo- = clot, -cyte = cell.
Lymphatic and Immune
Deck 1 of 15
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It means a second pair of eyes verified the term and definition match an authoritative source (a current text, a peer-reviewed reference, or an FDA label). Cards without the badge are still drawn from licensed material but we haven't done the second pass yet. Treat them as study pointers, not gospel.
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Browse mode is for scanning, search, and finding a specific card. Study mode is for active recall: it shows one card at a time, you try to answer before flipping, and you mark it as known. For real learning, use Study mode. For reference, use Browse.
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We label every card with how far we've checked it so you can decide how much weight to give it. If a card has no verification badge, it was extracted but hasn't been cross-checked yet. We surface it anyway because most of it is still useful, and hiding incomplete work would be dishonest.