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2 years ago

Definiton Concentric contraction

Medicine

2 answers:

V125BC [204]2 years ago

6 0

Answer:

A concentric contraction is a type of muscle activation that causes tension on your muscle as it shortens.

seraphim [82]2 years ago

4 0

In a contraction, the muscle tension rises to meet the resistance then remains stable as the muscle shortens. During contractions, the muscle lengthens as the resistance becomes greater than the force the muscle is producing.

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Suppose that arteriosclerosis is narrowing the artery at the rate of dR/dt = −0.02 mm per year. Find the rate at which blood flo

nirvana33 [79]

Answer:

0.6mm per year .

Explanation:

Please see attachment .

5 0

3 years ago

What is most likely to occur in a patient infected with a mutant strain of Bordetella pertussis that lacks functional adhesins?

Nata [24]

Answer:

The correct answer is D.

Explanation:

Bordetella pertussis is a gram-negative coccobacillus that causes a disease called whooping cough.

The bacterium infests the patients by colonizing lung epithelial cells. To do so, it requires adhesins, called filamentous haemagglutinin, fimbriae and pertactin. Once the bacterium is attached to the lung epithelial cells, it produces a cytotoxin that prevents their cilia from moving.

Another virulent factor from B. pertussis is the pertussis toxin, which alters host immune system through the inhibition of phagocytes response to it.

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3 years ago

Bodybuilders that take anabolic steroids such as androstenedione and testosterone often suffer from gynecomasty (enlarged breast

Whitepunk [10]

Answer:

Gynaecomastia occurs due to

1) Feedback inhibition of pituitary.

2) Conversion of exogenous androgens into estrogen (aromatization)

Substrate : Androgen

Product : Estradiol ( estrogen )

Enzyme involved : Aromatase

Explanation:

Gynaecomastia is a condition in which the mammary

glands, or breasts, enlarge and become sore and

tender to touch. It is due to the chemical change

in testosterone brought about by a process called

aromatisation, when the male hormone is converted

to a form of estrogen, the female sex hormone.

There is initially a sore feeling in the breast. A

skin ridge appears on the outer side of the areola

together with a halo appearance around the area

but no swelling. As the course continues, a swelling

develops and it becomes tender. Fatty tissue

builds up around the area and the breast becomes

prominent. At times there may be a secretion of

fluid from the nipple when it is squeezed. Steroids

should be stopped. If recovery does not occur by

the end of 2 months, surgery should be considered.

Other causes of gynaecomastia that may need to

be considered are the use of medications such as

Tagamet, a treatment for gastric problems, HCG and

spironolactone. Some body builders use this latter

drug to reduce body fluid. Occasionally boys in the

post-pubertal phase develop breast enlargement due

to endocrine imbalance totally unrelated to steroids.

Gynaecomastia also occurs as a result of feedback inhibition of the pituitary.

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3 years ago

How are dendrites synthesized in a neuron?

hram777 [196]

Answer:

The processing power of the mammalian brain is derived from the tremendous interconnectivity of its neurons. An individual neuron can have several thousand synaptic connections. While these associations yield computational power, it is the modification of these synapses that gives rise to the brain's capacity to learn, remember and even recover function after injury. Inter-connectivity and plasticity come at the price of increased complexity as small groups of synapses are strengthened and weakened independently of one another (Fig. 1). When one considers that new protein synthesis is required for the long-term maintenance of these changes, the delivery of new proteins to the synapses where they are needed poses an interesting problem (Fig. 1). Traditionally, it has been thought that the new proteins are synthesized in the cell body of the neuron and then shipped to where they are needed. Delivering proteins from the cell body to the modified synapses, but not the unmodified ones, is a difficult task. Recent studies suggest a simpler solution: dendrites themselves are capable of synthesizing proteins. Thus, proteins could be produced locally, at or near the synapses where they are needed. This is an elegant way to achieve the synapse specific delivery of newly synthesized proteins.

Explanation:

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3 years ago

During a disaster, how might the efficient triage of patients help increase a hospital’s surge capacity?

Naily [24]

Answer:

As more people rush into the hospital, less spave willl be available depedning on where they are placed, what happened, and what care is needed. If there was a fire, there would be alot of people with burns or smoke inhalation causing the hospitals disatser response to take act differenetly instead if there was an epidemic where people are sick but not usually physically harmed.

Explanation:

3 0

2 years ago