Haustra
/ˈhɔːstrə/
Small pouches in the colon caused by sacculation, which give the colon its segmented appearance.
Haversian Canal
/həˈvɜːrʒən kəˈnæl/
Minute tubes in the outermost region of bone which allow blood vessels and nerves to pass through.
Hematocrit
/hɪˈmætəkrɪt/
The ratio of the volume of red blood cells to the total volume of blood.
Hematopoiesis
/ˌhiːmətəpɔɪˈiːsɪs/
The production of all types of blood cells including formation, development, and differentiation.
Hemoglobin
/ˈhiːməˌɡloʊbɪn/
A red protein responsible for transporting oxygen in the blood of vertebrates.
Hemolysis
/hiːˈmɒlɪsɪs/
The rupture or destruction of red blood cells.
Hemostasis
/ˌhiːməˈsteɪsɪs/
The stopping of a flow of blood.
Hepatic
/hɪˈpætɪk/
Relating to the liver.
Hepatocyte
/hɪˈpætoʊˌsaɪt/
A liver cell, responsible for protein synthesis and detoxification.
Hiatus
/haɪˈeɪtəs/
A natural opening or perforation through a structure (e.g., the esophageal hiatus in the diaphragm).
Hippocampus
/ˌhɪpəˈkæmpəs/
A complex brain structure embedded deep into temporal lobe; it has a major role in learning and memory.
Histamine
/ˈhɪstəmiːn/
A compound released by cells in response to injury and in allergic and inflammatory reactions.
Homeostasis
/ˌhoʊmioʊˈsteɪsɪs/
The tendency toward a relatively stable equilibrium between interdependent physiological processes.
Hormone
/ˈhɔːrmoʊn/
A regulatory substance produced in an organism and transported in tissue fluids such as blood to stimulate specific cells into action.
Hyaline Cartilage
/ˈhaɪəlɪn ˈkɑːrtɪlɪdʒ/
A translucent bluish-white type of cartilage present in the joints, the respiratory tract, and the immature skeleton.
Hydrostatic Pressure
/ˌhaɪdrəˈstætɪk ˈprɛʃər/
The pressure exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity.
Hypercapnia
/ˌhaɪpərˈkæpniə/
Excessive carbon dioxide in the bloodstream, typically caused by inadequate respiration.
Hyperplasia
/ˌhaɪpərˈpleɪʒə/
The enlargement of an organ or tissue caused by an increase in the reproduction rate of its cells.
Hypertonic
/ˌhaɪpərˈtɒnɪk/
Having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.
Hypertrophy
/haɪˈpɜːrtrəfi/
The enlargement of an organ or tissue from the increase in size of its cells.
Hypothalamus
/ˌhaɪpəˈθæləməs/
A region of the forebrain below the thalamus which coordinates both the autonomic nervous system and the activity of the pituitary.
Hypoxia
/haɪˈpɒksiə/
Deficiency in the amount of oxygen reaching the tissues.