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IRINA_888 [86]
3 years ago
7

According to the law of conservation of matter, in any food chain we know that

Biology
2 answers:
irina [24]3 years ago
8 0
Energy is not being created or destroyed, it is being transferred from one level to the next.

victus00 [196]3 years ago
7 0
Energy is being transferred from one level to another


(please man can you give me brainly. i need one more lol)
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Ventricular systole begins during the __________ phase of the cardiac cycle. Ventricular systole begins during the __________ ph
Zina [86]

Answer

              Ventricular systole begins during the  <u>isovolumetric contraction </u>phase of the cardiac cycle.

Explanation

1. Ventricular ejection

The forceful expulsion of blood from the ventricles into the aorta and the pulmonary arteries.

2. Isovolumetric contraction

                     The interval between the closing of the AV valves and the opening of the semilunar valves (aortic and pulmonary valves) is known as isovolumetric contraction. it is the beginig of systole. it is the first chamber systolic event. The myocardial muscle fibers have begun to shorten but have not developed enough pressure in the ventricles to overcome the aortic and pulmonary end-diastolic pressures and open the aortic and pulmonary valves. During this period of muscle fiber contraction, the ventricular volumes do not change.

3. Ventricular filling  

                 In this stage AV valve is opened and the blood that has accumulated in atria flow rapidly into ventricles. The ventricular volume increase rapidly. A third heart sound known as S3 is heared during this stage.

4. Isovolumetric relaxation

                  It is the beginning of diastole. The AV valve are closed at beginig. The atrium in diastole has been filling with blood on top of the closed AV valve, causing atrial pressure to rise gradually. The pressure in the ventricles continues to drop. Ventricular volume is at a minimum and is ready to be filled again with blood.


5 0
3 years ago
The bicarbonate buffering system in the blood is the most important buffering system in the ECF. Bicarbonate ion and carbonic ac
wlad13 [49]

The bicarbonate buffering system in the blood is the most important buffering system in the ECF. Bicarbonate ion and carbonic acid are the key components of this buffering system. The weak base <u>bicarbonate</u> serves to buffer the strong acid <u>H+</u><u>.</u> The buffer to the strong base <u>OH-</u><u> </u>is <u>carbonic acid</u>. The byproduct of these reactions is <u>water.</u>

Explanation:

A buffer system utilizes chemical buffers and resists any changes in the pH and adjusts acidity and alkalinity of the medium by binding or releasing H+ ions accordingly.  

A bicarbonate buffering system in the ECF regulates the bicarbonate level and maintains the normal acidity level of blood.

Sodium bicarbonate reacting with a strong acid (HCl) produces a weak acid (carbonic acid) and sodium chloride. A strong base like (NaOH) reacts with carbonic acid producing bicarbonate and water.

NaHCo3 + HCl → H2CO3 + NaCl

H2Co3 + NaOH → HCO3 + H20

The acidity of the blood is regulated by maintaining the ratio of bicarbonate and carbonic acid at 20:1 under normal conditions through the bicarbonate buffer system. The carbonic acid level is regulated by the respiratory system; while carbonate level is regulated by the renal system.

8 0
2 years ago
Plz plz plz pls help u will save my life
Ainat [17]

Answer:

B) increase in number

Explanation:

This is called natural selection. Basically, the organism that has mutated in a way that helps it survive best will pass on that mutation.

3 0
3 years ago
Differentiate between ;
Rasek [7]

Answer:

1) The main difference between Fats and Oils is that, fats are usually derived from animals, whereas oils are usually derived from plants.

Fats and oils are very important for every human body. It is mainly essential for daily dietary plan. Fats and oils are totally different from each other. In simple terms, fats are animal fats whereas oils are vegetable oils. The other difference is fats tend to be solids at room temperature; on the other hand, oils tend to be liquid at room temperature. Remember, on the daily basis the two terms can be used interchangeably because both, fats and oils contain 9 calories per grams.

2) Phospholipids are similar to triglycerides, but they do vary slightly in form and function. While triglycerides have glycerol and three fatty acids, phospholipids have glycerol, two fatty acids and a phosphate. Phosphates are molecules with charges and have oxygen and phosphorus. ... Fat cells do not store phospholipids.

3) Thoracic cavity, also called chest cavity, the second largest hollow space of the body. It is enclosed by the ribs, the vertebral column, and the sternum, or breastbone, and is separated from the abdominal cavity (the body’s largest hollow space) by a muscular and membranous partition, the diaphragm. It contains the lungs, the middle and lower airways—the tracheobronchial tree—the heart, the vessels transporting blood between the heart and the lungs, the great arteries bringing blood from the heart out into general circulation, and the major veins into which the blood is collected for transport back to the heart. The heart is covered by a fibrous membrane sac called the pericardium that blends with the trunks of the vessels running to and from the heart. The thoracic cavity also contains the esophagus, the channel through which food is passed from the throat to the stomach.

4) An organelle (think of it as a cell's internal organ) is a membrane bound structure found within a cell. Just like cells have membranes to hold everything in, these mini-organs are also bound in a double layer of phospholipids to insulate their little compartments within the larger cells.

5) Tissues are groups of similar cells that have a common function. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system.

6) Absorption: The process of absorbing food in the form of nutrients into the blood stream of the body. Assimilation: The process of nutrients being absorbed by each cell of the body in the form of energy. Egestion: Secretion of waste, unwanted and excess substances from the body after food the as been digestion

hope this answer helps you!!

please mark as brainliest... thank you!

8 0
3 years ago
Earth has undergone some catastrophic changes from time to time. Which of these most likely explains why life on Earth continued
kherson [118]

A- a wide diversity of spesoces


6 0
3 years ago
Read 2 more answers
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