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mamaluj [8]
3 years ago
10

While listening to someone’s heart, a doctor discovers that the “lub” sound is weaker than the “dubb” sound. What might this clu

e suggest about the functioning of the heart valves?
Biology
2 answers:
stellarik [79]3 years ago
8 0
The heart valve is slower than the lub and the sound need to increase
dangina [55]3 years ago
6 0

Answer:

This clue suggests that the heart valves functions to prevent the backward flow of blood.

Explanation:

The "lubb" sound is produced when the atrioventricular valves in the heart close. These valves are deep inside the heart and are between the upper (atrial) and lower (ventricular) chambers. The "dupp" sound is produced when the semilunar valves (aortic and pulmonary) close. The valves close to prevent backflow from the blood ejected from the ventricles

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<span>Both photoautotrophs and chemoautotrophs synthesize organic compounds from (inorganic) carbon dioxide, a process known as carbon fixation. Photoautotrophs get the energy to perform these reactions from light. Chemoautotrophs get it from electron donors such as hydrogen sulfide and ammonia. Cyanobacteria, by contrast, convert nitrogen from the atmosphere into ammonia, a process known as nitrogen fixation.</span>
4 0
3 years ago
What is meaning of carbon dioxide ​pls help
Sliva [168]

Answer:

Carbon dioxide is a gas consisting of one part carbon and two parts oxygen. It is one of the most important gases on the earth because plants use it to produce carbohydrates in a process called photosynthesis

Explanation:

Hope it helps

Mark my answer as brainlist

have a nice day

4 0
3 years ago
Read 2 more answers
In cats the allele for short hair is dominant over the allele for long hair. A short haired male and long haired female have kit
SCORPION-xisa [38]

Answer:

Genotype of parents:                  Ss     x     ss

Genotype of offsprings:                  Ss    ss

Expected ratio of short to long:      2  :   2 = 1 :  1

The actual ratio in this problem is Eight kittens have short hair and 3 have long hair: 8 : 3

Explanation:

In cats the allele for short hair is dominant over the allele for long hair. (SS or Ss for short hair; ss for long hair).

A short haired male and long haired female have kittens. Eight kittens have short hair and 3 have long hair.

For the parents to have been able to produce long haired offsprings, it means both parents possess one copy each of the recessive traits. Thus we have

Phenotype of parent: A short haired male and long haired female

Genotype of parents:                  Ss     x     ss

Genotype of offsprings:                  Ss    ss

Expected ratio of short to long:      2  :   2 = 1 :  1

The actual ratio in this problem is Eight kittens have short hair and 3 have long hair: 8 : 3

4 0
3 years ago
(My kingdom for a shoe! Sam's biology teacher instructed the class to throw their shoes in a pile. Based on shoe characteristics
Brilliant_brown [7]

Answer:

I think the answer is B

Explanation:

6 0
3 years ago
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Explain how the structure of compact bone relates to its function.
natka813 [3]

Answer:

Explanation:

Compact bone aka cortical bone is a dense, solid and rigid in which bony matrix with ground org. Substances and salts densely filled and leave tiny spaces known as lacunae. These spaces contain osteocytes also called as bone cells. Inside of these osteons there is a central canal which supplies blood vessels and nerves within bone. These vessels provide blood to the spongy bone and living cells housed within compact bones.

Structure of Compact bone: Basic unit of Compact bone is called osteon also known as haversian system. Each osteon consist of four parts.

1. Haversian canal which consists blood vessels and nerves acts as a site of hematopoiesis which is one of the functions of Compact bone.

2.lamellae are concentric rings of strong matrix consisting Calcium and phosphorus. this gives the bone its strength and hardness to bear body weight.

3.Lacunae contains osteocytes.

4.Canaliculi links osteocytes and provide route for nutrients to reach osteocytes.

6 0
3 years ago
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