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Zarrin [17]
2 years ago
14

Which structure is the initial entry way for air to enter the respiratory system?

Biology
1 answer:
Alexxx [7]2 years ago
6 0
It is the nose I think.
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The role of pigments in the photosynthesis reaction is to
pashok25 [27]

Answer:

Option A, Start the reaction by absorbing light energy

Explanation:

Chlorophyll is a green color pigment in plant that helps in entrapping sunlight. Being green in color, it absorbs the blue and red light and reflects the green light. The molecules of chlorophyll gains energy from sunlight and then jumps to higher energy levels by the process known as photo excitation. These excited molecules get ionized to further initiate the process of photosynthesis.

Hence, option A is correct.

4 0
3 years ago
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The respiratory system branches like the circulatory. Oxygen and carbon dioxide diffuse between the end of these branches and th
Feliz [49]

Answer:

1. Ends of the respiratory branches are called alveoli.

2. C. To control blood flow to different areas of the body depending on activities

Explanation:

1. The trachea divides into left and right primary bronchi which in turn divide multiple times upon entering the lungs and make the bronchial tree.

The final branches of the bronchial tree are the terminal bronchioles that lead to alveoli. The alveoli are the balloon-shaped structures and serve as the site of gas exchange between the blood and inhaled air.  

2. The opening and closing of sphincters of capillary beds regulate the direction of blood flow. The opening of sphincters allows the blood to flow into associated branches of capillary beds while closed sphincters direct the blood from arterioles to venules via thoroughfare channel.

This local change in blood flow is responsible for the autoregulation of blood flow to different tissues to match their respective metabolic demands. For example, during physical activity, more blood is directed to skeletal and cardiac muscles.

8 0
3 years ago
Which of the following is an autotroph <br> A-dodder B-sunflower <br> C-fungi D-algae
Naddik [55]

Answer:

dodder

Explanation:

dodder autotroph

3 0
2 years ago
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A frameshift mutation that occurs very early in a protein sequence would have what effect on the protein's structure? A. The pri
AlekseyPX

Answer:

C. Primary, secondary, and tertiary structures would be altered

Explanation:

Frameshift mutations refer to the mutations that change the reading frame of the gene. Frameshift mutations are mostly caused by insertion or deletion of nucleotide since addition or loss of nucleotide alters all the codons present downstream of the point of the mutation site. If frameshift mutation occurs at the beginning of the protein sequence, all the downstream amino acids would be altered.

The changed amino acid sequence would alter the primary structure of the protein. Since the secondary and tertiary structure of proteins is determined by interactions between the R groups of amino acids, their polarity, charge, etc., the altered amino acid sequence would also alter secondary, and tertiary of the protein.

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2 years ago
How do basaltic rocks differ from granitic rocks?
DanielleElmas [232]

Answer:

ddasd

Explanation:

5 0
3 years ago
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