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42 terms

Circulation and Respiration

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Cardiovascular system
consists of the heart, blood vessels and blood
Heart
A hollow muscular organ that pumps blood throughout the body.
Atrium
receives blood that comes into the heart
Pacemaker
Sends out signals that make the heart muscle contract (beat)
Ventricle
Pumps blood out of the heart.
Valve
A flap of tissue that prevents blood from flowing backward.
Arteries
Blood vessels that carry blood away from the heart.
Capillaries
Tiny, narrow vessels that blood flows into after passing through the arteries
aorta
The largest artery in the body
Coronary arteries
An artery that supplies blood to the heart itself
Pulse
Alternating expansion and relaxation of an artery wall
Diffusion
The process by which molecules move from an area of higher concentration to lower concentration.
Pressure
Is force per unit area
Blood pressure
The pressure that is exerted by the blood against the walls of blood vessels
Plasma
The liquid part of blood
Red blood cells
Take up oxygen in the lungs and deliver it to cells elsewhere in the body.
Hemoglobin
An iron-containing protein that binds chemically to oxygen molecules
White blood cells
The body's disease fighters
Platelets
Cell fragments that play an important role in forming blood clots.
Shock
Failure of the circulatory system to provide an adequate supply of oxygen-rich blood to all parts of the body.
Lymphatic system
a network of veinlike vessels that returns the fluid to the bloodstream
Lymph
The fluid that is inside the lymphatic system
Lymph nodes
Filter lymph, trapping bacteria and other disease-causing microorganisms in the fluid.
Respiration
the process by which oxygen and glucose undergo a complex series of chemical reactions inside cells.
Mucus
a thick sticky liquid that moistens the air and keeps the lining from drying out. `
Cilia
tiny hairlike extensions that move together in a sweeping motion.
Pharynx
the throat
Trachea
Windpipe
Bronchi
The passages that direct air into the lungs
Lungs
The main organ of the respiratory system
Alveoli
Ting sacs of lung tissue specialized for the movement of gasses between air and blood
Diaphragm
A large dome shaped muscle that plays an important role in breathing
Larynx
Voicebox, located in the top part of the trachea underneath the epiglottis
Vocal Cords
Folds of connective tissue that produce your voice, stretch across the opening of the larynx
atherosclerosis
A condition in which an artery wall thickens as a result of buildup of fatty materials
Heart attack
Occurs when part of the heart muscle is blocked
Hypertension
A disorder when your blood pressure is consistently high
Stroke
Death of brain tissue that can result when a blood vessel in the brain is either blocked by a clot or bursts.
Emphysema
A serious disease that destroys lung tissue and causes breathing difficulties
Bronchitis
An irritation if the breathing passages in the small passages become narrower and may be clogged with mucus.
asthma
Disease when Airways in the lungs narrow significantly
pneumonia
Infection that causes fluid to collect in the alveoli. Causes difficulty taking in oxygen and getting CO2 out.