All categories

3 years ago

Explain how plastic can be both beneficial and detrimental at the same time.

Biology

2 answers:

svp [43]3 years ago

6 0

Answer:

Some benefits of plastic are that plastic packaging helps protect and preserve goods, while reducing weight in transportation, which saves fuel, reduces greenhouse gas emissions and are low in cost.

Some disadvantages are that toxic chemicals can leach out of plastic and can be found in the blood and tissue of nearly all of us. Exposure to them is linked to cancers, birth defects, impaired immunity, endocrine disruption and other ailments

zhannawk [14.2K]3 years ago

4 0

It effects animal environments negatively when the waste is not controlled and I don’t think there’s much positive things lol

You might be interested in

What can you do to make sure you conduct a lab activity in a safe manner. Give 3 examples

ankoles [38]

Answer:

Explanation:

wear gloves if fire

wear goggles always

no long droopy sleves

no food

7 0

3 years ago

Read 2 more answers

Which of the following organisms is the causative agent of Hansen's disease (leprosy)? A. Pseudomonas aeruginosaB. Mycobacterium

ch4aika [34]

Answer:

C. Mycobacterium leprae

Explanation:

Mycobacterium leprae is the causative organism for Hansen's disease (leprosy).
Mycobacterium leprae is a rod-shaped bacteria which is quite common in warm tropical countries.
It is an intracellular pathogen which can cause an either tuberculoid or lepromatous form of leprosy with an incubation period varying from 9 months to 20 years.
The bacteria are capable of affecting the skin, eyes, nerves, etc.
The disease can be treated effectively however if left untreated the bacteria are capable of causing a crippling nerve damage.

4 0

3 years ago

Arrange these muscle contraction events in the correct order.

erastovalidia [21]

Answer:

1. nerve stimulus

4. calcium channels open

10. acetylcholine vesicles move to endplate

7. exocytosis occurs releasing acetylcholine into synaptic cleft

3. acetylcholine binds to receptor

6. impulse rides along sarcolemma

9. impulse enters the cells via the t-tubule

5. sarcoplasmic reticulum releases calcium

8. calcium binds to troponin moving tropomyosin out of the way

2. myosin attaches to actin causing a twitch

Explanation:

The central nervous system generates an action potential (1) that travels to the muscle fiber activating the calcium channels (4). Calcium triggers vesicles fusion to the presynaptic membrane (10) releasing acetylcholine (Ach) into the synaptic space (7). Once there, Ach binds to its receptors (3) on the postsynaptic membrane of the skeletal muscle fiber, causing ion channels to open. Positively charged sodium ions cross the membrane to get into the muscle fiber (sarcoplasm) and potassium leaves the cell. The difference in charges caused by these ions transport charges positively the muscle fiber membrane (6). It depolarizes. The action potential enters the t-tubules (9) depolarizing the inner portion of the muscle fiber.

Contraction initiates when the action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing calcium into the sarcolemma (5). At this point, the muscle is at rest, and the tropomyosin is inhibiting the attraction strengths between myosin and actin filaments. Tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites (8). Myosin heads join to the uncovered actin-binding points forming cross-bridges (2), and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin (2). As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament. Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

6 0

3 years ago

What is the main energy molecule in the body?

dolphi86 [110]

ATP the energy is derived from the chemical bond energy in food particles. Which therefore they serve as food for cells

8 0

3 years ago

A nurse is preparing an inservice education program for a group of nurses about dystocia involving problems with the passenger.

mina [271]

The answer you are looking for is, A. persistent occiput posterior position

6 0

4 years ago