rapid rate
few motor units :)
few motor units
smooth muscle
smooth muscle
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.
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.
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.
tetanic contraction.
Asthma causes contraction of the bronchial smooth muscle.
smooth muscle
It can cause vascular smooth muscle contraction
smooth muscle