Answer:
D. structures that have lost all or most of their function over evolutionary time
Explanation:
the question states that the leg bones are almost entirely unused because of evolution
Answer:
- Calcium binds to troponin C
- Troponin T moves tropomyosin and unblocks the binding sites
- Myosin heads join to the actin forming cross-bridges
- ATP turns into ADP and inorganic phosphate and releases energy
- The energy is used to impulse myofilaments slide producing a power stroke
- ADP is released and a new ATP joins the myosin heads and breaks the bindings to the actin filament
- ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, starting a new cycle
- Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.
Explanation:
In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing <u>calcium into the sarcolemma.</u> At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join to the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament. Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.
Complete Question
Ruben Ward has been weight lifting and eating a high protein diet. Below is Ruben's profile and what he ate for a day. He entered his profile information and food intake into Diet & Wellness Plus and then pulled the Diet & Wellness Plus Reports. View Ruben’s Intake vs Goals and Macronutrient Ranges Reports and then answer the questions below. Profile for Ruben Ward 1. Age: 19 years old 2. Gender: Male 3. Height: 5 ft, 8 inches 4. Weight: 205 lbs 5. Non-Smoker 6. Activity Level: Active
Ruben has recently taken up weight lifting, and his friends at the gym mistakenly believe they should eat more protein to build muscle. The DRI for protein for healthy adults is 0.8 g per kg body weight. If Ruben weighs 205 lbs (93 kg), how many grams protein per kg body weight did he eat on this day?
a. 5.37 g/kg
b. 10.33 g/kg
c. 3.55 g/kg
d. 4.88 g/kg
Answer:
c. 3.55g/kg
Explanation:
RDI means Recommended Dietary intake. It is the required amount of a nutrient expected to be taken by an individual for optimal health.
The Recommended Dietary Intake I'd protein falls withing the range of 0.8 grams per kg to 1.8 grams per kg
For Reuben
He weighs 93 kg
If Reuben consumed 330 grams of protein, his grams of protein per kg body weight is
330 grams ÷ 93kg
= 3.55g/kg.
Robert Steve and James are three new organisms ( lizard species ) Steve can breath under water he has scaly moist lizard skin a long strong tail and very sharp claws weighs 20 pounds and is 6ft long Steve prefers to eat small fish.
Robert can't breath under water has scaly dry lizard skin very sharp teeth and is very poisonous he has night vision weighs 5 pounds and is 2 ft long he mainly eats small bugs like lies and wasps.
James on the other hand is completely different he has is 10 feet long weighs 180pounds can run 5 miles per hour has powerful jaws that can break bones he has razor sharp teeth and claws and poisonous spit he has a smell radius of 15 miles and is a very heavy set he also prefers to eat big land animals like deer he's a Carnavor.
all of these Organisms are in a similar species (Lizard) and have similar characteristics ( Like scaly lizard skin and sharp claws) but they all have different traits and abilities.
I Hope this helped you.
