The answer is; A
When an impulse from the motor neuron reached the neuromuscular junction, the voltage-dependent calcium channels are activated and the neurotransmitter released from the presynaptic cleft. When the neurotransmitter binds to their receptors on the sarcolemma, the muscle fibers become depolarised; the calcium is released from their vesicles. The Ca2+ ions are important in the power stroke because they bind to troponin. Upon binding calcium, troponin moves tropomyosin away from the myosin-binding sites on actin. Powered by the energy from ATP molecule, the myosin is able to bind on the actin and slides over the actin filament.
Answer:
Dioxins are highly toxic and can cause cancer, reproductive and developmental problems, damage to the immune system.
The aryl hydrocarbon receptor is a protein best known for its role in mediating toxicity.
The AhR has roles in regulating immunity, stem cell maintenance, and cellular differentiation.
Explanation:
Pressure, Density, Temperature