Anatomy Week 1 — Chapter 1 Study Materials Flashcards

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Anatomy

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Anatomy is the study of body part structures and their relationships. It examines the form and arrangement of organs and tissues across different levels of organization.

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Physiology

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Physiology is the study of body part functions and how they operate to maintain homeostasis. It often focuses on cellular and molecular mechanisms that underlie organ and system activities.

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Gross anatomy

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Gross (macroscopic) anatomy studies large structures visible to the naked eye. It includes regional, system, and surface approaches to examine organs and their relationships.

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Microscopic anatomy

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Microscopic anatomy studies structures too small to be seen without magnification. It includes cytology, the study of cells, and histology, the study of tissues.

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Cytology

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Cytology is the microscopic study of cells, including their structure and function. It helps explain how cellular components contribute to tissue and organ function.

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Histology

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Histology is the microscopic study of tissues and how different cell types combine to form functional units. It links cellular organization to organ-level activities.

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Embryology

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Embryology studies anatomical and physiological development before birth. It explains how tissues and organ systems form and differentiate during early life stages.

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Complementarity

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The principle of complementarity states that function always reflects structure and a structure's capabilities depend on its form. This idea links anatomy and physiology at all levels of organization.

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Levels of organization

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The human body is organized from chemical to organismal levels: chemical, cellular, tissue, organ, organ system, and organismal. Each higher level depends on the structure and function of the levels below it.

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Homeostasis

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Homeostasis is the maintenance of a stable internal environment despite continuous external change. Multiple organ systems contribute to homeostasis, with the nervous and endocrine systems playing major regulatory roles.

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Negative feedback

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Negative feedback reduces or shuts off the original stimulus to maintain variables near a set point. It is the most common feedback mechanism in the body, for example insulin secretion in response to high blood sugar.

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Positive feedback

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Positive feedback enhances or exaggerates the original stimulus and is usually used for infrequent events. Examples include platelet plug formation and blood clotting.

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Receptor

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A receptor is a sensor that monitors a controlled variable and responds to stimuli. It sends input to the control center when deviations from the set point occur.

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Control center

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The control center determines the set point for a variable and processes input from receptors. It then sends output signals to effectors to produce a response.

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Effector

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An effector receives output from the control center and produces a response that changes the controlled variable. Effectors may decrease the stimulus in negative feedback or amplify it in positive feedback.

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Serous membrane

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Serous membranes (serosa) are thin, double-layered membranes that cover surfaces within the ventral body cavity. They include a parietal layer lining cavity walls and a visceral layer covering organs, with serous fluid in between to reduce friction.

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Pleura

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The pleura are the serous membranes associated with the lungs; each lung is enclosed by its own pleural cavity. The pleural layers secrete serous fluid that allows smooth lung movement within the thorax.

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Pericardium

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The pericardium is the serous membrane that surrounds the heart and forms the pericardial cavity. It protects the heart and reduces friction during cardiac movements.

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Body planes

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Body planes are imaginary surfaces used to section the body for anatomical study. The three common planes are sagittal (dividing left and right), frontal/coronal (dividing front and back), and transverse (dividing top and bottom).

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Anatomical position

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The standard anatomical position is upright with feet slightly apart, palms facing forward, and thumbs pointing away from the body. Directional terms are always defined relative to this position.