All categories

3 years ago

Why do the different skeletal muscle fiber types vary in the speed and duration of their twitches?

Medicine

1 answer:

IrinaVladis [17]3 years ago

5 0

Answer:

The different skeletal muscle fiber types vary in the speed and duration of their twitches due to -

b) They vary in the rate of hydrolysis of ATP

c) They vary in the removal of Ca+ from the cytosol

Explanation:

There are mainly two types of muscle fibers , i.e.

a) slow twitching, long contraction duration( type I fibers)

b) First twitching but short duration of contraction. ( type II fibers).

Now think of the physiology of muscle. Two components are important, cytosolic Ca++ concentration and Availability of ATP. K+ is related to the action potential ( none or all law, there is no relation to the duration with respect to the potassium). For long contraction muscle fibers need a more steady supply of ATP, and also consistent high concentration of cytosolic Ca++ for muscle contraction to happen. So, these two factor is important for the duration of twitching. So the answer is option f .

You might be interested in

Dual Antiplatelet Therapy Using Cilostazol in Patients With Stroke and Intracranial Arterial Stenosis

Talja [164]

Background- In patients with intracranial artery stenosis, a long-term advantage of dual antiplatelet therapy (DAPT) over single antiplatelet therapy (SAPT) for the prevention of recurrent stroke has not been proven. We studied patients with intracranial arterial stenosis who were enrolled in the Cilostazol Stroke Prevention Study for Antiplatelet Combination trial, a randomized controlled trial in high-risk Japanese patients with ischemic stroke, to compare the efficacy and safety of DAPT with cilostazol and clopidogrel or aspirin to those of SAPT with clopidogrel or aspirin. Techniques and Outcomes In patients with ischemic stroke with symptomatic or asymptomatic intracranial arterial stenosis of at least 50% in a major intracranial artery, we compared the vascular and hemorrhagic events between DAPT and SAPT.

Patients were divided into two groups: 275 were given DAPT, while 272 were given SAPT. In contrast to SAPT, which had a higher risk of serious or life-threatening bleeding, DAPT had a lower risk of ischemic stroke (hazard ratio [HR], 0.47; 95% CI, 0.23-0.95); and a composite of stroke, myocardial infarction, and vascular mortality (HR, 0.48; 95% CI, 0.26-0.91). Conclusions In patients with intracranial artery stenosis following stroke, DAPT using cilostazol was superior than SAPT using clopidogrel or aspirin for the prevention of recurrent stroke and vascular events without raising bleeding risk.

<h3>What is stroke?</h3>

When anything prevents blood flow to a portion of the brain or when a blood artery in the brain bursts, a stroke, also known as a brain attack, happens. The brain either ages or suffers harm in both scenarios. A stroke may result in permanent brain damage, chronic disability, or even fatality.

To learn more about stroke with the help of given link:

brainly.com/question/26482925

#SPJ4

4 0

2 years ago

A client with primary hypothyroidism has been taking levothyroxine for a year. Laboratory results today show high levels of TSH.

dolphi86 [110]

Answer:

c. The abnormality is in the thyroid gland itself.

Explanation:

Primary hypothyroidism arises from a pathology in the thyroid gland itself and occurs when the thyroid gland is not able to perform one of its many physiology. Secondary hypothyroidism starts at the level of the pituitary gland and results from under secretion of TSH. TSH is needed to trigger the release of the T3 and T4 stored in the thyroid gland. Tertiary hypothyroidism is caused by a decrease level of the TRH from the hypothalamus. This reduced level, in turn, reduces TSH and thyroid hormone levels in the blood, hence in the body and the patient suffer the symptoms.

4 0

3 years ago

An unconscious adult victim is gasping for breath and having difficulty breathing. the scene is safe and help has been called. n

NISA [10]

An unconscious adult victim is gasping for breath and having difficulty breathing. The scene is safe and help has been called. Next you should use the head tilt chin lift procedure.

An unconscious patient is at risk of blocking their airway and suffocating. The main reason for this occurring is due to the tongue. An unconscious patient loses all their muscular tone, and this includes the tongue! The tongue can fall back and block the airway.

This situation is an emergency – without a supply of oxygen reaching the lungs, the patient will suffocate in a matter of minutes.

In CPR, we use the head-tilt, chin-lift method to open the airway.

How to Perform a Head-tilt Chin-lift :

Kneel next to the patient’s head
Place one hand on the patient’s forehead and tilt the head gently backward
Place two fingers under the bony part of their chin and lift the chin vertically upwards
Take care not to place any pressure on the soft part of the neck as this could obstruct the airway

If a cervical spine injury is suspected, then the modified jaw thrust would be used in place of "head-tilt, chin-lift". The jaw thrust is a technique used on patients with a suspected spinal injury and is used on a supine patient.

Learn more about head tilt chin lift procedure here : brainly.com/question/14823768

#SPJ4

6 0

1 year ago

Even though we all know that junk food is not healthy, it can be difficult to resist it, especially when we are busy. Do you thi

Gwar [14]

It is not unhealthy for us to take junk food as we usually, frequently and most of the times need them especially when we are very busy at work or busy to prepare normal dietary food

However the quality of the food we eat determines how well and healthy we would be.

<h3>What are nutrition?</h3>

Nutrition is simply means obtaining food substances

There are different types of nutrition

Heterotrophic nutrition
Autotrophic nutrition

Examples of junk foods include the following

Biscuits
Snacks
Chocolates
Sweets

So therefore, it is not unhealthy for us to take junk food as we usually, frequently and most of the times need them especially when we are very busy at work or busy to prepare normal dietary food but at the same time we should always find time to take mucj more healthy and nutritional food

Learn more about nutrition:

brainly.com/question/20617658

#SPJ1

5 0

2 years ago

the nurse is assessing a newborn's vital signs and notes the following: hr 138, rr 42, temperature 98.7of (37.1oc), and blood pr

Vlad1618 [11]

The correct option is the last option. The nurse is assessing a newborn's vital signs and notes the following: HR 138, RR 42, temperature 98.7oF (37.1oC), and blood pressure 70/40 mm Hg. Which action should the nurse prioritize? The nurse should prioritize Document normal findings

<h3>What are vital signs?</h3>

The term vital signs in the field of medicine refers to the measurement of the basic functions of the body. The basic function of the body is usually four in number, these are: body temperature, blood pressure, breathing rate, and pulse rate.

The body temperature refers to the degree of hotness or coldness of the human body. The measurement is done using a thermometer. The blood pressure refers to the pressure at which the blood flows in the circulatory system. This is measured with the blood pressure meter. The pulse rate is also measured with same meter as the blood pressure meter.

The vital signs measured by the nurse are within the normal limits so the nurse should go on and document the findings. Hence the final option is the correct option.

Read more on vital signs here: brainly.com/question/970323

#SPJ1

complete question

The nurse is assessing a newborn's vital signs and notes the following: HR 138, RR 42, temperature 98.7oF (37.1oC), and blood pressure 70/40 mm Hg. Which action should the nurse prioritize?

Report tachypnea.

Recheck blood pressure in 15 minutes.

Put warming blanket over infant.

Document normal findings.

7 0

2 years ago