Step 1A nerve impulse moves down and axon and causes the release of acetylcholine. Step 2Acetylecholine causes the pulse to spread across the surface of the sarcolemma. Step 3The nerve impulse enters the T Tubules and Sarcoplasmic Reticulum, which stimulates the release of calcium ions. Step 4Calcium ions combine with troponin, shifting troponin and exposure of the myosin binding sites to the stock. Step 5ATP breaks ADP + P. The released energy activates the myosin crossings and leads to the slipping of thin stockmilofilament past the thick myosin membrane membranes. Step 6The sliding of the myofilaments draws the Z lines, the sarcoma shortens, the muscle fiber contract and thus muscle contracts. Step 7ACh is activated by acetylcholinesterase, which inhibits the nerve impulse conduction across the sarcolemma. Step 8Nerve impulse is inhibited, calcium ions are actively traced back into the Sarcoplasmic Reticulum, using the energy of the previous ATP degradation. Step 9The low calcium concentration causes the myosin crossings to separate from the think-in-tensile filaments and return the stockmilofilaments to their relaxed position. Step 10Sarcomeres return to their rest lengths, relax muscle fibers and relax the muscles.
The plesiosaur flipper is convergent with other flipper forms becuase even though they don't share the same evolutionary path, in other words, they don't have a common ancestor with flippers, different animals reached to a simmilar structure with the same function that is locomotion in water.
Process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
Heterotrophs cant make their own food. They cant make there own food so they eat animals and plats and all sorts of different things. Because of this heterotrophs are known as consumers. Anything that consumes/eats things are consumers.
Answer: Erythrocytes also known as Red blood cell compose about 40-45% of blood
Explanation: 40-45% of the blood volume is erythrocytes i.e the red blood cell. It contains heamoglobin a special protein that carries oxygen to the lungs.
