Answer: if the upper leg muscles were damaged, (You would not be able to extend the leg straight).
Explanation:
The upper leg muscles, which can also be called the thigh, are made up of three sets of muscles which include:
--> the hamstring muscles: These are located at the BACK of the thigh. They are made up of three long muscles which includes the semimembranous muscle, the semitendinosus muscle, and the biceps femoris muscle.
--> the quadriceps muscles: They are located at the FRONT of the thigh. They consists of four individual muscles which includes the three vastus muscles and the rectus femoris.
--> the adductor muscles: They are located at the medial compartment of the thigh and is consist of the following muscles: gracilis, obturator externus, adductor brevis, adductor longus and adductor magnus.
The quadriceps, hamstrings and adductor muscles work together to straighten (extend) and bend (flex) the leg. Therefore when there is damage to the upper leg muscles, you would not be able to extend the leg straight.
The chemical reaction taking place when a dipeptide becomes two amino acids is B) Hydrolysis.
We are constantly surrounded by pathogens and other microbes that we need to defend ourselves against. The first line of defence against infection stops the pathogens from entering the body. These first lines of defence are called non-specific defences as they are general defences, not designed to fight a particular type of pathogen.
The skin covers almost all parts of the body and acts as a physical barrier to prevent infection from pathogens.
Skin
If it is cut or grazed, it immediately begins to heal itself, often by forming a scab, which prevents infection:
A blood vessel is damaged, leaving rough edges.
Blood exits the wound. Delicate platelets in the blood are broken open by the rough edges.
Chemicals are released into the blood which causes a series of reactions.
This makes the blood clot and later form a scab.
Parts of the body that do not have skin have developed other ways to prevent infection. For example, the eyes produce tears, which contain enzymes, and these are chemical barriers.
Nose
The nose has internal hairs, which act as a physical barrier to infection. Cells in the nose produce mucus. This traps pathogens before they can enter the lungs. When the nose is blown, mucus is removed and any pathogens are trapped within it. Any remaining mucus, and the trapped pathogens, are broken down by acid in the stomach.
Trachea and bronchi
The trachea runs from the nose towards the lungs. The cells that line the trachea also have hairs called cilia, which are much smaller than those in the nose. These are called ciliated cells. The cells waft their hairs and move mucus and pathogens upwards towards the throat where it is swallowed into the stomach. Other cells called goblet cells create mucus in order to trap pathogens. The production of mucus in the airways is a physical barrier.
Stomach
Stomach acid benfits the digestive system as it helps in the breaking down of food. Additionally, It is part of the body's non-specific first line of defence. It is hydrochloric acid and, while it does us no harm, it is strong enough to kill any pathogens that have been caught in mucus in the airways or consumed in food or water. Stomach acid is a chemical barrier against infection.
By Ayomide
Source: BBC Bitesize
Answer:
Explanation:
Respuesta:Presentan una gran variedad de peligros, estos dependen de que tipo sean los residuos contaminantes, ya que varían en muchas características como los tóxicos, patogénicos, etc.
Como se puede observar existen muchos tipos de basuras y con diferentes características diferentes que llegan a variar por su peligrosidad u toxicidad.
Answer:
2. The gene responsible for eye color is on the X chromosome.
Explanation:
<em>For X-linked genes, a male can either be affected or unaffected because the Y chromosome is hypothesized not to carry any gene. Females on the other hand can be a carrier, affected or unaffected because the two sex chromosomes carry genes.</em>
If eye color allele in drosophilia is represented by R, the cross between F1 red-eyed heterozygous female and red-eyed males can be illustrated below:
Red-eyed heterozygous female =
Red-eyed male =
x
Progeny:
Out of the 2 male progeny from the cross, 1 () is white-eyed while the remaining one () is red-eyed
Hence, the result shows that the gene for eye color in Drosophilia is X-linked.
Option 2 is the correct answer.