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The heart has ____one way valves which open and close with each heartbeat. (1 point) one two three four
Weegy: The heart has four one way valves which open and close with each heartbeat. (More)
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Asked 4/2/2013 12:56:52 PM
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What is a muscle fiber?
Weegy: Muscle fiber is the term used to collectively describe the many long, multi-nucelated muscle cells, or myofibers, that make up skeletal muscle. [ Individual fibers are arranged into bundles — termed fascicles — that are then further organized into groups of fascicles, which form the muscle belly. Each level of organization is sheathed in a membrane of connective tissue and is serviced by blood vessels, lymph vessels, and nerves. ] (More)
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Asked 4/2/2013 12:49:23 PM
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_________ receive blood from the capillaries after gas exchange takes place. (1 point) Veins Arteries Capillaries Alveoli
Weegy: Arteries receive blood from the capillaries after gas exchange takes place. (More)
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Asked 4/2/2013 12:54:59 PM
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8. __________ refers to the pressure in the arteries when the heart beats (contracts). (1 point)
Weegy: Systolic blood pressure refers to the pressure in the arteries when the heart beats (More)
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Asked 4/2/2013 12:50:49 PM
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Slow-twitch muscle fibers are used when
Weegy: Slow-twitch Muscle Fibers or Type I fibers are used in lower-intensity exercises such as very light resistance work aimed at muscular endurance and long-duration aerobic activities such as 5K and 10K runs. [ Slow-twitch Muscle Fibers are identified by slow contraction times and a high resistance to fatigue. Structurally, they have a small motor neuron and fiber diameter, a high mitochondrial and capillary density, and a high myoglobin content. ST fibers also have a low supply of creatine phosphate, low glycogen content, and a high store of triglycerides (the stored form of fat). ] (More)
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Asked 4/2/2013 12:47:57 PM
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