Search results for: 'Central nervous system'

Watch Later 0:26

By: Administrator, Views: 10412

Hemodynamics is the dynamics of blood flow. The circulatory system is controlled by homeostatic mechanisms, such as hydraulic circuits are controlled by control systems. Hemodynamic response continuously monitors and adjusts to conditions in the body and its environment.

Watch Later 2:18

Allergic Rhinitis

By: Administrator, Views: 9354

Allergic rhinitis, also known as hay fever, is a type of inflammation in the nose which occurs when the immune system overreacts to allergens in the air. Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid from the nose...

Watch Later 0:16

Brain Anatomy Animation (Part 2 of 2)

By: Administrator, Views: 10907

Its nervous tissue consists of millions of nerve cells and fibers. It is the largest mass of nervous tissue in the body. The brain is enclosed by three membranes known collectively as the meninges: dura mater arachnoid pia mater The major structures are the: cerebrum cerebellum dienc...

Watch Later 2:30

Primary and secondary response to infection

By: HWC, Views: 6393

• Pathogens enter the body by penetrating the non-specific barriers in the skin and mucus membranes. • Pathogens first encounter macrophages and natural killer cells that carry out phagocytosis and cytolysis respectively. • A pathogen's first encounter with the immune system can promo...

Watch Later 0:55

Inflammation Animation

By: Administrator, Views: 9652

Inflammation is caused by a number of physical reactions triggered by the immune system in response to a physical injury or an infection. Inflammation does not necessarily mean that there is an infection, but an infection can cause inflammation.

Watch Later 0:34

Dendrite Animation

By: Administrator, Views: 10057

Dendrites (from Greek δένδρον déndron, "tree"), also dendrons, are branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project. Electrical stimula...

Watch Later 2:28

Action potentials - electrical characteristics and generation

By: HWC, Views: 6581

• An action potential is the nervous impulse or signal for long distance communication. Each action potential is generated at the cell's trigger zone. • Action potentials are considered an all-or-nothing phenomena because they are either generated or not. • The generation of an action...

Watch Later 2:35

Contraction cycle of a sarcomere

By: HWC, Views: 7176

• A single nervous signal releases Ca2+ ions into the sarcoplasm and initiates the contraction cycle. step 1. ATP hydrolysis • ATP provides the to move myosin molecules back into the energized configuration necessary to perform the power stroke. Step 2. Crossbridge attachment • Myosin...

Watch Later 1:28

Rh blood type and complications during pregnancy & Fertilization

By: HWC, Views: 4083

Complications can arise if an Rh- woman is impregnated by an Rh+ man. The fetus maybe Rh+. During childbirth, some of the fetal Rh+ cells may leak into the maternal bloodstream. The woman's immune system views the Rh+ as foreign and makes antibodies against it. If the woman becomes pr...

Search Results