materials are more reactive and self heat more readily and in smaller amounts than Category 2 materials. Self-heating substances will be identified with the pictogram shown below. In addition, Section 2 of the Safety Data Sheet (SDS) will include one of the following hazard statements: â¢ H251 Self-heating; may catch fire â¢ H252 Self-heating in large quantities; may catch fire . Fire Hazards Self-heating of a substance or mixture is a process where the gradual reaction of that substance or mixture with oxygen in air generates heat. If the rate of heat production exceeds the rate of
Source: Amelia Shoemark. ' Motile ' (or moving) cilia are found in the lungs, respiratory tract and middle ear. These cilia have a rhythmic waving or beating motion (see right). They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation.They also help propel sperm.hey are primordial. The ciliary apparatus is connected to cell cycle progression and proliferation, and cilia play a vital part in human and animal development and in everyday life. The length of a single cilium is 1-10 micrometres and width is less than 1 micrometre.
The bladder is connected to the urethra, which delivers the urine to the outside of the body. The primary function of the urinary tract system is to remove substances from the blood, to form urine and help to regulate various metabolic processes. (Click an organ above to see its description.).Urethra. Function In females, the urethra is a tube that conveys urine from the urinary bladder to the outside of the body. In males, the urethra also functions as a urinary canal and as a passageway for cells and secretions from various reproductive organs.Structure The wall of the urethra is lined with mucous membranes and contains a relatively thick layer of smooth muscle tissue.he urinary tract system is a group of organs of the body, which are responsible for the excretion of urine. In humans, the urinary system includes 2 kidneys, a pair of tube-like structures, called the ureters, which connect the kidneys to the bladder.