A. Calcium would be sent to the sarcoplasmic reticulum, causing contractions to stop. A muscle fiber ceases to contract the instant ATP is depleted. Furthermore, contraction halts when signals from the motor neuron stop, leading to the repolarization of the sarcolemma and T-tubules, thus closing the voltage-gated calcium channels in the sarcoplasmic reticulum. Calcium ions are subsequently pumped back into the sarcoplasmic reticulum, allowing tropomyosin to once again obstruct the binding sites on the actin filaments.
Answer:
1. The boy detected an unpleasant odor from the packet that was left out on the table, caused by rancidity.
2. The packet stored in the refrigerator remained odor-free because it was not exposed to air.
Explanation:
Rancidity occurs when fats and oils undergo oxidation, leading to a change in their smell and flavor.
Exposure of food items to oxygen results in oxidation, which produces unpleasant smells and tastes.
c. bivalents. In the initial phase of meiosis, specifically during prophase, bivalents are created, which consist of a tetrad made up of two paired chromosomes and four chromatids—each chromosome originating from one parent. In contrast, mitosis does not involve the formation of bivalents, although chromatids, homologs, centromeres, and spindles are present in both processes.
Answer:
candy tablets being introduced (a)
Explanation:
the candy triggers a quicker and more substantial reaction
