II. Muscles in vitro can exhibit twitch, summation, and tetanus. A. The rapid contraction and relaxation of muscle fibers is called a twitch. B. A whole muscle also produces a twitch in response to a single electrical pulse in vitro.1. The stronger the electric shock, the stronger the muscle twitch, whole muscles can produce graded contractions.2.. The motor neuron and the muscle fibers it innervates are called a motor unit. 1. When a muscle is composed of many motor units (such as in the hand), there is fine control of muscle contraction. 2. The large muscles of the leg have relatively few motor units, which are correspondingly large in size.
The Indus River, also called the SindhÅ« River (Sindhi: Ø³ÙÚÙ Ø¯Ø±ÙØ§ â), or AbÄsÄ«n (Pashto: Ø§Ø¨Ø§Ø³ÙÙ â) in Khyber Pakhtunkhwa, is one of the longest rivers in Asia.It flows through Pakistan, the Indian state of Jammu and Kashmir and western Tibet.he word India is derived from the Indus River. In ancient times, India initially referred to those regions immediately along the east bank of the Indus, but by 300 BC, Greek writers including Herodotus and Megasthenes were applying the term to the entire subcontinent that extends much farther eastward.
The Indus is the longest river in Pakistan. Pakistan is a country in Asia. Look for it on the map. Afghanistan is to the west, China to the north, and India to the east.The Indus River begins in the Himalaya Mountains, and flows nearly 3,000 kilometres to the Arabian Sea.In the Sanskrit language of Ancient India, the Indus was called the Sindhu.Other rivers such as the Sarasvati join the Indus as it flows down to the sea. The Indus Valley civilisation is sometimes called the Sindhu-Sarasvati civilisation. A valley is a physical feature. It's the land shaped by a river.n the Sanskrit language of Ancient India, the Indus was called the Sindhu. Other rivers such as the Sarasvati join the Indus as it flows down to the sea. The Indus Valley civilisation is sometimes called the Sindhu-Sarasvati civilisation. A valley is a physical feature. It's the land shaped by a river.