There are two fluids that service the cells of the body; blood and interstitial fluid. Blood is composed of plasma and a variety of cells. It transports nutrients and wastes. Interstitial fluid bathes the cells of the body. Nutrients and oxygen diffuse from the blood and the interstitial fluid and then into the cells. Wastes […]
Today was the 20th Annual Carolina Blood Drive. I received an email about it about two weeks ago and signed up. Their goal was to receive 1200 units of blood. Last I heard they had received 650. I will be curious to see if they met their goal.
The Red Cross had everything very organized. The whole process took about […]
I know you are just dying to know how a skeletal muscle contracts. So here goes…
First, an action potential (AP) reaches the axon terminal in a nerve. Then the voltage gated calcium channels open and there is an influx of calcium. The calcium causes Acetylcholine (ACh) to release into the synaptic cleft. Acetylcholine crosses the […]
There are three types of muscle tissue; skeletal, cardiac and smooth. These tissues have six characteristics:
Excitability-the ability to respond to stimuli and produce electrical signals.
Contractility-the ability to shorten and generate force once excited.
Extensibility-the ability to stretch without damaging the tissue.
Elasticity-the ability to return to normal length after being extended.
Thermal-the ability to produce heat.
I will mostly […]
In your body, you need to regulate your blood glucose level. This is regulated by two hormones, insulin and glucagon. They are secreted by the endocrine pancreas. Insulin is secreted by the beta cells while glucagon is secreted by the alpha cells. Insulin promotes glucose uptake from blood which decreases blood glucose. Another role is […]
This may sound familiar to some of you. The General Adaptation Syndrome is how someone reacts to stress, whether it be long-term or short-term. Stress can be almost anything. Examples are starvation, a car accident, losing a loved one or a difficult day at work. There is a wide range of stress effectors.
The three stages […]
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