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masya89 [10]
3 years ago
13

Summarize how the actions of the heartbeat make their first and second sounds.

Biology
1 answer:
professor190 [17]3 years ago
7 0
When the blood is pumped from the right ventricle to the pulmonary artery.. the "lubb" sound is heard... while ..when the oxygenated blood is pumped by the left ventricle to the aorta.. a larger "dubb" sound is heard... 
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Equal masses of granite, iron, copper, and lead are placed in sunlight. Based on specific heat, which material will warm up the
levacccp [35]

Answer:

Lead

Explanation:

The material that will warm up the fastest would be<u> lead.</u>

<em>The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit of the substance by one degree. The higher the specific heat capacity of a substance, the higher the amount of heat required to raise the temperature of the substance and vice versa.</em>

The specific heat capacity (in J/g °C) of granite, iron, copper, and lead are as follows:

Granite - 0.790

Iron    - 0.450

Copper - 0.385

Lead - 0.129

From the table, <u>lead has the lowest specific heat capacity, hence, it will be the fastest to get warmed when equal masses of all the substances are placed in the sunlight.</u>

3 0
3 years ago
Can you list some facts about Food webs.
Novosadov [1.4K]

Answer:

A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass.

Explanation: A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.

7 0
3 years ago
Read 2 more answers
The term higher brain centers refers to those areas of the brain involved in higher-order functions. These centers would probabl
marysya [2.9K]

Answer: A. Cerebrum

Explanation:

The cerebrum which is located below the cerebral cortex serves as the main thought and control center of the brain. It is the seat of higher-level thought like emotions and decision making (as opposed to lower-level thought like balance, movement, and reflexes). It is known as the higher brain center

8 0
3 years ago
What is an essential role played by large intestine bacteria?
Likurg_2 [28]

Answer:

The correct answer is: synthesize vitamin K and B-complex vitamins.

Explanation:

The large intestine, an important region of the gastrointestinal tract, is populated with bacteria that maintain our bodies healthy. The term used to describe these organisms that live in the digestive tract is gut microbiota.

The relationship between humans and the gut microbiota is not only non-harmful but also beneficial to humans. <u>Bacteria ferment dietary fibers into </u><u>short-chain fatty acids</u><u> for us to absorb it</u>. Gut microbiota also plays a crucial role in synthesizing vitamin B and vitamin K, as well as metabolizing <u>sterols and bile acids</u>. These bacteria act much like an endocrine system that regulates intestinal function with the use of short-chain fatty acids, as if they were hormones.

<u>Vitamin K</u><u> is important for</u><u> blood clotting</u><u>, while </u><u>vitamin B</u><u> intervenes in </u><u>cellular metabolism</u>.

6 0
3 years ago
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. John is jogging on a winter day. The outdoors temperature is 31 degrees F. Yet, his body temperature is 98 degrees F. What ter
Tanzania [10]
The term that best describes the process causing this difference in temperature is A. homeostasis.
Homeostasis is the process of heat regulation in our body, so it makes sense to choose this answer. B, C, and D have to do with some kind of a disease.
5 0
3 years ago
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