Feelings of pain and discomfort are crucial to the survival and evolution of animals, as they help to detect injuries or existential threats and pinpoint their location in the body. Pain signals are produced by nociceptors, ...
"Don't poke the bear," they said. But that's exactly what a team of scientists have been doing to discover the secrets of blood clotting.
Apr 13, 2023
0
16
Most of us think little of why we feel pleasantly full after eating a big holiday meal, why we start to cough after accidentally inhaling campfire smoke, or why we are hit with sudden nausea after ingesting something toxic. ...
Aug 31, 2022
0
42
For cancer cells to metastasize, they must first break free of a tumor's own defenses. Most tumors are sheathed in a protective "basement" membrane—a thin, pliable film that holds cancer cells in place as they grow and ...
Mar 8, 2021
0
136
That very fine hair-line object that you see being pulled across the screen is actually a neuron being made. A research team led by McGill University and the Montreal Neurological Institute has managed to create new functional ...
Jan 28, 2016
0
328
Stroke the soft body of a newborn fruit fly larva ever-so-gently with a freshly plucked eyelash, and it will respond to the tickle by altering its movement—an observation that has helped scientists at the University of ...
Dec 9, 2012
3
0
A Weizmann Institute experiment in which volunteers learned to sense objects' locations using just "rat whiskers" may help improve aids for the blind.
Nov 5, 2012
5
0
A study on live tissue cells is the first to reveal how channels that allow sodium to enter into breast cancer cells enable tumors to grow and spread.
Jul 25, 2024
0
18
A group of scientists at UCL have successfully created mechanical force sensors directly in the developing brains and spinal cords of chicken embryos, which they hope will improve understanding and prevention of birth malformations ...
Jul 12, 2024
0
20
One in six patients in primary care reported cannabis use, with 35% of those using at levels indicating moderate- to high-risk for cannabis use disorder, new UCLA research finds.
Jun 5, 2024
0
39
In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses, a technical term for influences which cause deformation of matter. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.
This text uses material from Wikipedia, licensed under CC BY-SA
