Answer:
Large intestine
Explanation:
After the completion of digestion process in the small intestine, the indigestible residual materials are passed to the large intestine.
The large intestine serves three primary functions -
- Absorption of water and electrolytes
- Production and absorption of vitamins
- Formation and propelling of feces accomplishing their removal through the rectum.
When water gets absorbed, the indigestible materials get dehydrated and during feces formation they are compacted and then eliminated through the rectum.
I believe the answer is B. they respond to stimulli
There won't be any Photosynthesis occurring and plants and tress will eventually die.. When the plants die the omnivorous animals will die of hunger..... Also we will be suffering from famine
Answer:
The correct answer is 3: "<em>High levels of Ca2+ are expected to be found </em><em>within the sarcoplasmic reticulum</em>".
Explanation:
Muscular contraction is a highly regulated process that depends on free calcium concentration in the cytoplasm. Amounts of cytoplasmic calcium are regulated by <u>sarcoplasmic reticulum</u> that functions as a storage of the ion.
When a nerve impulse reaches the membrane of a muscle fiber, through acetylcholine release, the membrane depolarizes producing the entrance of calcium from <u>extracellular space</u>. The impulse is transmitted along the membrane to the sarcoplasmic reticulum, from where calcium is released. At this point, <em>tropomyosin is obstructing binding sites for myosin on the thin filament</em>. The calcium channel in the sarcoplasmic reticulum controls the ion release, that activates and regulates muscle contraction, by increasing its cytoplasmic levels. When <em>calcium binds to the troponin C</em>, <em>the troponin T alters the tropomyosin by moving it and then unblocks the binding sites,</em> making possible the formation of <em>cross-bridges between actin and myosin filaments.</em> When myosin binds to the uncovered actin-binding sites, ATP is transformed into ADP and inorganic phosphate.
Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.
Bacteria have been the very first organisms to live on earth in the waters of the first oceans. At first, there were only anaerobic heterotrophic bacteria.
