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Softa [21]
2 years ago
10

HELP ME PLSS ILL GIVE U 25 POINTS!

Biology
2 answers:
Usimov [2.4K]2 years ago
5 0
1. Closed
It keeps the blood from tongue backward up into the right atrium when the ventricle contracts

2. Lungs

3. Gives up carbon dioxide and picks up oxygen

4. can

10. The lungs
soldier1979 [14.2K]2 years ago
3 0

Explanation:

liway sm but i don't know that

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Dominik [7]
Deep veins is the answer
7 0
2 years ago
Roundworms
Studentka2010 [4]

Answer:

Think about it. Worms move with MUSCLES. So the first answer is None.

The appendage of a roundworm is not present.

How do you think worms turn and move? They are segmented. The symmetry  of a worm is Bilateral.

Explanation:

I'm doing the assignment myself. Look up the answers and use common logic.

Download doc
3 0
3 years ago
Just by looking at the color of a freshly drawn blood sample, how could you distinguish between blood that is well oxygenated an
Wittaler [7]

Answer:

Explanation:

There are two types of blood that flows through our bodies: oxygenated and deoxygenated. Oxygenated blood is the one that is pumped in the left side of the atrium in the heart. As its name tells us, is the one that is highly with oxygen and low in carbon dioxide. Normally a sample of an oxygenated blood will be very bright in red due to the amount of blood cells in it. Deoxygenated blood is the one that is pumped in the right side of the atrium in the heart. This blood is the one that is low in oxygen and high in carbon dioxide. It is also known as the venous blood. Normally a sample of a deoxygenated blood will be darker almost going on blue.

6 0
3 years ago
Albinism is a recessive trait in humans that is controlled by a single gene. How many recessive alleles must a person have to ha
olga_2 [115]
Answer;
Two recessive alleles are the number of alleles that a person must have to have albinism.

Explanation;
When a trait is recessive, such as albinism, an individual must have two copies of a recessive allele to express that particular trait. Recessive alleles are denoted by a lowercase letter , such as b versus B. Only individuals with a bb genotye will express a recessive trait, hence, the offspring must receive one recessive trait from each parent to exhibit the recessive trait. 

6 0
3 years ago
Read 2 more answers
Please explain why the gastric glands secret pepsinogen and not pepsin
Luba_88 [7]

Answer:

The correct answer is - to protect the cells of these secretory glands from pepsin.

Explanation:

Pepsinogen is an inactive form of enzyme pepsin that is released by specific cells called chief cells within the gastric lining Releasing the inactive form of pepsin in preventing the auto-digestion of protective proteins and the cells of these secretory glands in the lining of the digestive tract.

Pepsinogen is activated by acidic pH to pepsin of the stomach lumen and the cell lining of the stomach is protected by mucus lining.

6 0
3 years ago
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