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When weak but smooth muscle contraction is desired a few motor units are stimulated at a?
rapid rate
When a weak but smooth muscle are desired what are stimulated at a rapid rate?
few motor units
Which type of muscle ca be stimulated by norepinephrine?
smooth muscle
In smooth muscle the calcium needed for contraction comes mainly from?
In smooth muscle, the calcium needed for contraction primarily comes from the extracellular space. When smooth muscle cells are stimulated, calcium channels in the cell membrane open, allowing calcium ions to flow into the cell. Additionally, some calcium can also be released from the sarcoplasmic reticulum, but the extracellular influx is the main source for initiating contraction. This influx of calcium activates the contraction process by interacting with calmodulin and subsequently activating myosin light chain kinase.
What of the muscle tissue can sustain longer contraction?
smooth muscle
Which type of muscle CANNOT contract without being stimulated by the nervous system?
Cardiac muscle. Unlike skeletal and smooth muscle, the contraction of cardiac muscle is involuntary and requires stimulation from the nervous system. This ensures that the contractions of the heart are synchronized and coordinated.
Where are the calcium ions stored in a muscle fiber?
Calcium ions in muscle fibers are stored in the sarcoplasmic reticulum, which is a specialized form of endoplasmic reticulum found in muscle cells. When a muscle is stimulated to contract, the sarcoplasmic reticulum releases calcium ions into the cytoplasm, triggering muscle contraction.
What are smooth muscle contractions stimulated by?
Smooth muscle contractions are primarily stimulated by the autonomic nervous system, which releases neurotransmitters such as acetylcholine and norepinephrine. Additionally, hormones like oxytocin and epinephrine can also promote contraction. Mechanical stretch and local factors, such as changes in pH or oxygen levels, may further influence smooth muscle activity. These contractions are important for various bodily functions, including digestion and blood vessel regulation.
A maximal sustained muscle contraction is called a?
tetanic contraction.
What conditions cause contractions of arteriole smooth muscle?
Asthma causes contraction of the bronchial smooth muscle.
What are the muscles that are slow in contraction and relaxation?
smooth muscle
What does noradrenaline do?
It can cause vascular smooth muscle contraction
