A slow heart rate is called bradycardia. Some irregular heartbeats are normal: 1  Sinus arrhythmia is the normal variation in heart rate that accompanies breathing in and out.  Sinus tachycardia is the normal increase in the heart rate that occurs in healthy people when they are excited, exercising, or have a fever.
There are four tabby patterns that have been shown to be genetically distinct: Mackerel, Classic, spotted, and ticked. A fifth includes tabby as part of another basic color pattern. The patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively).All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds.A modified Classic tabby is found in the Sokoke breed.he patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively). All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds. A modified Classic tabby is found in the Sokoke breed.
The name tabby is believed to have come from the word atabi a type of silk spun in the Attabiah region of Baghdad. This silk was exported in large quantities to the British Isles where it was noticed how similar the stripped pattern was to the coat of the tiger cat.